msm: board-8064: Wrap PMIC 8921 GPIO 23 in a gpio-regulator device

Wrap PMIC 8921 GPIO 23 in a gpio-regulator device so that the
Atmel MXT touchscreen driver can be simplified. GPIO 23 represents
the TS_PWR_EN_PMIC signal on 8064 devices. This drives a FET which
switches the 3.3V regulator output for touchscreen use.

Change-Id: I1f4fd02506640eda16bed4d25c03ad410ffb9287
Signed-off-by: David Collins <collinsd@codeaurora.org>
diff --git a/arch/arm/mach-msm/board-8064.h b/arch/arm/mach-msm/board-8064.h
index e1451f5..58f0ac0 100644
--- a/arch/arm/mach-msm/board-8064.h
+++ b/arch/arm/mach-msm/board-8064.h
@@ -37,6 +37,7 @@
 
 #define GPIO_VREG_ID_EXT_5V		0
 #define GPIO_VREG_ID_EXT_3P3V		1
+#define GPIO_VREG_ID_EXT_TS_SW		2
 
 #define APQ8064_EXT_3P3V_REG_EN_GPIO	77