iio/drivers/hid-sensor: use HZ macros

HZ unit conversion macros are available in units.h, use them and remove
the duplicate definition.

Link: https://lkml.kernel.org/r/20210816114732.1834145-8-daniel.lezcano@linaro.org
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Chanwoo Choi <cw00.choi@samsung.com>
Cc: Christian Eggers <ceggers@arri.de>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Lukasz Luba <lukasz.luba@arm.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: MyungJoo Ham <myungjoo.ham@samsung.com>
Cc: Peter Meerwald <pmeerw@pmeerw.net>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Zhang Rui <rui.zhang@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/iio/common/hid-sensors/hid-sensor-attributes.c

@@ -6,12 +6,11 @@
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/time.h>
+#include <linux/units.h>
 
 #include <linux/hid-sensor-hub.h>
 #include <linux/iio/iio.h>
 
-#define HZ_PER_MHZ	1000000L
-
 static struct {
 	u32 usage_id;
 	int unit; /* 0 for default others from HID sensor spec */