[ARM] pxa/vpac270: remove TS_IRQ magic number

The touchscreen GPIO IRQ was used as a magic number. Define it properly in the
board header file. This is a simple cleanup patch.
Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>

arch/arm/mach-pxa/include/mach/vpac270.h

@@ -37,4 +37,6 @@
 
 #define	GPIO36_VPAC270_IDE_IRQ		36
 
+#define	GPIO113_VPAC270_TS_IRQ		113
+
 #endif

arch/arm/mach-pxa/vpac270.c

@@ -388,7 +388,7 @@ static pxa2xx_audio_ops_t vpac270_ac97_pdata = {
 };
 
 static struct ucb1400_pdata vpac270_ucb1400_pdata = {
-	.irq		= IRQ_GPIO(113),
+	.irq		= IRQ_GPIO(GPIO113_VPAC270_TS_IRQ),
 };
 
 static struct platform_device vpac270_ucb1400_device = {