iio: imu: inv_mpu6050: inv_mpu_core: Demote obvious misuse of kerneldoc to standard comment blocks

No attempt has been made to document any of the demoted functions here.

Fixes the following W=1 kernel build warning(s):

 drivers/iio/imu/inv_mpu6050/inv_mpu_core.c:444: warning: Function parameter or member 'st' not described in 'inv_mpu6050_set_lpf_regs'
 drivers/iio/imu/inv_mpu6050/inv_mpu_core.c:444: warning: Function parameter or member 'val' not described in 'inv_mpu6050_set_lpf_regs'
 drivers/iio/imu/inv_mpu6050/inv_mpu_core.c:480: warning: Function parameter or member 'indio_dev' not described in 'inv_mpu6050_init_config'
 drivers/iio/imu/inv_mpu6050/inv_mpu_core.c:862: warning: Function parameter or member 'st' not described in 'inv_mpu6050_set_lpf'
 drivers/iio/imu/inv_mpu6050/inv_mpu_core.c:862: warning: Function parameter or member 'rate' not described in 'inv_mpu6050_set_lpf'
 drivers/iio/imu/inv_mpu6050/inv_mpu_core.c:893: warning: Function parameter or member 'dev' not described in 'inv_mpu6050_fifo_rate_store'
 drivers/iio/imu/inv_mpu6050/inv_mpu_core.c:893: warning: Function parameter or member 'attr' not described in 'inv_mpu6050_fifo_rate_store'
 drivers/iio/imu/inv_mpu6050/inv_mpu_core.c:893: warning: Function parameter or member 'buf' not described in 'inv_mpu6050_fifo_rate_store'
 drivers/iio/imu/inv_mpu6050/inv_mpu_core.c:893: warning: Function parameter or member 'count' not described in 'inv_mpu6050_fifo_rate_store'
 drivers/iio/imu/inv_mpu6050/inv_mpu_core.c:954: warning: Function parameter or member 'dev' not described in 'inv_fifo_rate_show'
 drivers/iio/imu/inv_mpu6050/inv_mpu_core.c:954: warning: Function parameter or member 'attr' not described in 'inv_fifo_rate_show'
 drivers/iio/imu/inv_mpu6050/inv_mpu_core.c:954: warning: Function parameter or member 'buf' not described in 'inv_fifo_rate_show'
 drivers/iio/imu/inv_mpu6050/inv_mpu_core.c:975: warning: Function parameter or member 'dev' not described in 'inv_attr_show'
 drivers/iio/imu/inv_mpu6050/inv_mpu_core.c:975: warning: Function parameter or member 'attr' not described in 'inv_attr_show'
 drivers/iio/imu/inv_mpu6050/inv_mpu_core.c:975: warning: Function parameter or member 'buf' not described in 'inv_attr_show'
 drivers/iio/imu/inv_mpu6050/inv_mpu_core.c:1282: warning: Function parameter or member 'st' not described in 'inv_check_and_setup_chip'

Cc: Jean-Baptiste Maneyrol <jmaneyrol@invensense.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

drivers/iio/imu/inv_mpu6050/inv_mpu_core.c

@@ -433,7 +433,7 @@ static int inv_mpu6050_set_gyro_fsr(struct inv_mpu6050_state *st,
 	return regmap_write(st->map, st->reg->gyro_config, data);
 }
 
-/**
+/*
  *  inv_mpu6050_set_lpf_regs() - set low pass filter registers, chip dependent
  *
  *  MPU60xx/MPU9150 use only 1 register for accelerometer + gyroscope
@@ -467,7 +467,7 @@ static int inv_mpu6050_set_lpf_regs(struct inv_mpu6050_state *st,
 	return regmap_write(st->map, st->reg->accel_lpf, val);
 }
 
-/**
+/*
  *  inv_mpu6050_init_config() - Initialize hardware, disable FIFO.
  *
  *  Initial configuration:
@@ -847,7 +847,7 @@ error_write_raw_unlock:
 	return result;
 }
 
-/**
+/*
  *  inv_mpu6050_set_lpf() - set low pass filer based on fifo rate.
  *
  *                  Based on the Nyquist principle, the bandwidth of the low
@@ -884,7 +884,7 @@ static int inv_mpu6050_set_lpf(struct inv_mpu6050_state *st, int rate)
 	return 0;
 }
 
-/**
+/*
  * inv_mpu6050_fifo_rate_store() - Set fifo rate.
  */
 static ssize_t
@@ -945,7 +945,7 @@ fifo_rate_fail_unlock:
 	return count;
 }
 
-/**
+/*
  * inv_fifo_rate_show() - Get the current sampling rate.
  */
 static ssize_t
@@ -962,7 +962,7 @@ inv_fifo_rate_show(struct device *dev, struct device_attribute *attr,
 	return scnprintf(buf, PAGE_SIZE, "%u\n", fifo_rate);
 }
 
-/**
+/*
  * inv_attr_show() - calling this function will show current
  *                    parameters.
  *
@@ -1275,7 +1275,7 @@ static const struct iio_info mpu_info = {
 	.debugfs_reg_access = &inv_mpu6050_reg_access,
 };
 
-/**
+/*
  *  inv_check_and_setup_chip() - check and setup chip.
  */
 static int inv_check_and_setup_chip(struct inv_mpu6050_state *st)