[ARM] pxa: move IRQ handling of GPIO 0 and 1 outside of gpio.c

This is part of the work making gpio.c generic enough, the changes
include:

1. move IRQ handling of GPIO 0 and 1 outside (and back into irq.c)

2. pxa_init_gpio() accepts a range for muxed GPIO IRQs, and an IRQ
   number for the muxed GPIOs

3. __gpio_is_occupied() and __gpio_is_inverted() are made inline,
   and are moved into <mach/gpio.h> instead of generic gpio.c

Signed-off-by: Eric Miao <eric.miao@marvell.com>
diff --git a/arch/arm/mach-pxa/pxa27x.c b/arch/arm/mach-pxa/pxa27x.c
index c8b469b..a425ec7 100644
--- a/arch/arm/mach-pxa/pxa27x.c
+++ b/arch/arm/mach-pxa/pxa27x.c
@@ -21,6 +21,7 @@
 #include <mach/hardware.h>
 #include <asm/irq.h>
 #include <mach/irqs.h>
+#include <mach/gpio.h>
 #include <mach/pxa27x.h>
 #include <mach/reset.h>
 #include <mach/ohci.h>
@@ -330,7 +331,7 @@
 void __init pxa27x_init_irq(void)
 {
 	pxa_init_irq(34, pxa27x_set_wake);
-	pxa_init_gpio(121, pxa27x_set_wake);
+	pxa_init_gpio(IRQ_GPIO_2_x, 2, 120, pxa27x_set_wake);
 }
 
 /*