[ARM] 4063/1: ep93xx: fix IRQ_EP93XX_GPIO?MUX numbering

Fix incorrect IRQ numbering in arch-ep93xx/irqs.h (source: Applied
Data Systems 2.6.17 kernel tree.)
Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

include/asm-arm/arch-ep93xx/irqs.h

@@ -22,9 +22,9 @@
 #define IRQ_EP93XX_DMAM2P9		16
 #define IRQ_EP93XX_DMAM2M0		17
 #define IRQ_EP93XX_DMAM2M1		18
-#define IRQ_EP93XX_GPIO0MUX		20
-#define IRQ_EP93XX_GPIO1MUX		21
-#define IRQ_EP93XX_GPIO2MUX		22
+#define IRQ_EP93XX_GPIO0MUX		19
+#define IRQ_EP93XX_GPIO1MUX		20
+#define IRQ_EP93XX_GPIO2MUX		21
 #define IRQ_EP93XX_GPIO3MUX		22
 #define IRQ_EP93XX_UART1RX		23
 #define IRQ_EP93XX_UART1TX		24