iio: imu: Fix inv_mpu6050 dependencies

Not all archs have io memory.
Instead of selecting I2C_MUX (and bypassing the HAS_IOMEM dependency)
depend directly on it.

Fixes the following kconfig warning:
warning: (MEDIA_SUBDRV_AUTOSELECT && VIDEO_CX231XX && INV_MPU6050_I2C) selects I2C_MUX which has unmet direct dependencies (I2C && HAS_IOMEM)
And this build error:
ERROR: "devm_ioremap_resource" [drivers/i2c/muxes/i2c-mux-reg.ko] undefined!
ERROR: "of_address_to_resource" [drivers/i2c/muxes/i2c-mux-reg.ko] undefined!

Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

drivers/iio/imu/inv_mpu6050/Kconfig

@@ -9,9 +9,8 @@ config INV_MPU6050_IIO
 
 config INV_MPU6050_I2C
 	tristate "Invensense MPU6050 devices (I2C)"
-	depends on I2C
+	depends on I2C_MUX
 	select INV_MPU6050_IIO
-	select I2C_MUX
 	select REGMAP_I2C
 	help
 	  This driver supports the Invensense MPU6050 devices.