[ARM] pxa: fix missing underscores in mfp-pxa910.h

Underscores were missing.
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>

arch/arm/mach-mmp/include/mach/mfp-pxa910.h

@@ -160,7 +160,7 @@
 #define MMC1_WP_MMC1_WP		MFP_CFG_DRV(MMC1_WP, AF0, MEDIUM)
 
 /* PWM */
-#define GPIO27 PWM3 AF2		MFP_CFG(GPIO27, AF2)
+#define GPIO27_PWM3_AF2		MFP_CFG(GPIO27, AF2)
 #define GPIO51_PWM2_OUT		MFP_CFG(GPIO51, AF2)
 #define GPIO117_PWM1_OUT	MFP_CFG(GPIO117, AF2)
 #define GPIO118_PWM2_OUT	MFP_CFG(GPIO118, AF2)