mfd: palmas: Stop including of_gpio.h

It does not appear that any of palmas sub-drivers are using OF-based
gpio APIs, so let's stop including this header.

Signed-off-by: Dmitry Torokhov <[e-mail]>
Signed-off-by: Lee Jones <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

include/linux/mfd/palmas.h

···
 #include <linux/regmap.h>
 #include <linux/regulator/driver.h>
 #include <linux/extcon-provider.h>
-#include <linux/of_gpio.h>
 #include <linux/usb/phy_companion.h>
 
 #define PALMAS_NUM_CLIENTS		3