pwm: lpss: Make use of bits.h macros for all masks

Make use of the GENMASK() (far less error-prone, far more concise).
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Thierry Reding <thierry.reding@gmail.com>

drivers/pwm/pwm-lpss.c

@@ -10,6 +10,7 @@
  * Author: Alan Cox <alan@linux.intel.com>
  */
 
+#include <linux/bits.h>
 #include <linux/delay.h>
 #include <linux/io.h>
 #include <linux/iopoll.h>
@@ -26,7 +27,7 @@
 #define PWM_ENABLE			BIT(31)
 #define PWM_SW_UPDATE			BIT(30)
 #define PWM_BASE_UNIT_SHIFT		8
-#define PWM_ON_TIME_DIV_MASK		0x000000ff
+#define PWM_ON_TIME_DIV_MASK		GENMASK(7, 0)
 
 /* Size of each PWM register space if multiple */
 #define PWM_SIZE			0x400