hwmon: Replace deprecated CPU-hotplug functions.

The functions get_online_cpus() and put_online_cpus() have been
deprecated during the CPU hotplug rework. They map directly to
cpus_read_lock() and cpus_read_unlock().

Replace deprecated CPU-hotplug functions with the official version.
The behavior remains unchanged.

Cc: Jean Delvare <jdelvare@suse.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: linux-hwmon@vger.kernel.org
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/20210803141621.780504-14-bigeasy@linutronix.de
Signed-off-by: Guenter Roeck <linux@roeck-us.net>

drivers/hwmon/dell-smm-hwmon.c

@@ -248,9 +248,9 @@ static int i8k_smm(struct smm_regs *regs)
 {
 	int ret;
 
-	get_online_cpus();
+	cpus_read_lock();
 	ret = smp_call_on_cpu(0, i8k_smm_func, regs, true);
-	put_online_cpus();
+	cpus_read_unlock();
 
 	return ret;
 }

drivers/hwmon/fam15h_power.c

@@ -166,7 +166,7 @@ static int read_registers(struct fam15h_power_data *data)
 
 	memset(data->cu_on, 0, sizeof(int) * MAX_CUS);
 
-	get_online_cpus();
+	cpus_read_lock();
 
 	/*
 	 * Choose the first online core of each compute unit, and then
@@ -190,7 +190,7 @@ static int read_registers(struct fam15h_power_data *data)
 
 	on_each_cpu_mask(mask, do_read_registers_on_cu, data, true);
 
-	put_online_cpus();
+	cpus_read_unlock();
 	free_cpumask_var(mask);
 
 	return 0;