usb: gadget: pxa25x_udc: use correct header for gpio devm_ functions

commit c63d2225e7be ("usb: gadget: pxa25x_udc: use devm_ functions")
introduced the use of devm_gpio_request in this driver, but did not
correctly include the header file declaring this function, which
causes a build failure.

This changes pxa25x_udc to include linux/gpio.h instead of asm/gpio.h
to fix this.

Signed-off-by: Arnd Bergmann <[e-mail]>
Cc: Himangi Saraogi <[e-mail]>
Cc: Julia Lawall <[e-mail]>
Cc: Felipe Balbi <[e-mail]>
Signed-off-by: Felipe Balbi <[e-mail]>

drivers/usb/gadget/pxa25x_udc.c

···
 /* #define VERBOSE_DEBUG */
 
 #include <linux/device.h>
+#include <linux/gpio.h>
 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/ioport.h>
···
 
 #include <asm/byteorder.h>
 #include <asm/dma.h>
-#include <asm/gpio.h>
 #include <asm/mach-types.h>
 #include <asm/unaligned.h>