ARM: pxa: fix the build error because of missing gpio-pxa.h

arch/arm/mach-pxa/corgi_pm.c: In function ‘corgi_should_wakeup’:
arch/arm/mach-pxa/corgi_pm.c:102:2: error: implicit declaration of
function ‘GPIO_bit’
make[1]: *** [arch/arm/mach-pxa/corgi_pm.o] Error 1
make: *** [arch/arm/mach-pxa] Error 2

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/mach-pxa/corgi_pm.c

@@ -15,6 +15,7 @@
 #include <linux/kernel.h>
 #include <linux/delay.h>
 #include <linux/gpio.h>
+#include <linux/gpio-pxa.h>
 #include <linux/interrupt.h>
 #include <linux/platform_device.h>
 #include <linux/apm-emulation.h>