mfd: menelaus: Remove unused linux/gpio.h

linux/gpio.h is deprecated and subject to remove.
The driver doesn't use it, simply remove the unused header.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20240508114033.952578-1-andriy.shevchenko@linux.intel.comSigned-off-by: Lee Jones <lee@kernel.org>

drivers/mfd/menelaus.c

@@ -29,7 +29,6 @@
 #include <linux/bcd.h>
 #include <linux/slab.h>
 #include <linux/mfd/menelaus.h>
-#include <linux/gpio.h>
 
 #include <asm/mach/irq.h>