pwm: lpss: Include headers we are the direct user of

For the sake of integrity, include headers we are the direct
user of.

Replace the inclusion of device.h by a forward declaration
of struct device plus a (cheaper) of types.h as device.h is
an expensive include (measured in compiler effort).

Signed-off-by: Andy Shevchenko <[email protected]>
Acked-by: Thierry Reding <[email protected]>
Reviewed-by: Mika Westerberg <[email protected]>
Reviewed-by: Hans de Goede <[email protected]>
Acked-by: Uwe Kleine-König <[email protected]>

drivers/pwm/pwm-lpss.h

@@ -10,8 +10,10 @@
 #ifndef __PWM_LPSS_H
 #define __PWM_LPSS_H
 
-#include <linux/device.h>
 #include <linux/pwm.h>
+#include <linux/types.h>
+
+struct device;
 
 #define LPSS_MAX_PWMS			4