msm: gpio-v2: Add missing gpio_chip label

This label is expected by our unit tests.

Change-Id: Ibfbecbf95fde317dd3dd96c0e772ab4742bc2126
Signed-off-by: Michael Bohan <mbohan@codeaurora.org>
diff --git a/arch/arm/mach-msm/gpio-v2.c b/arch/arm/mach-msm/gpio-v2.c
index 6398676..7ada69a 100644
--- a/arch/arm/mach-msm/gpio-v2.c
+++ b/arch/arm/mach-msm/gpio-v2.c
@@ -245,6 +245,7 @@
 
 static struct msm_gpio_dev msm_gpio = {
 	.gpio_chip = {
+		.label		  = "msmgpio",
 		.base             = 0,
 		.ngpio            = NR_MSM_GPIOS,
 		.direction_input  = msm_gpio_direction_input,