regulator: Constify constraints name

There's no need for the API to modify it and having it const makes it
easier to use with random strings the board code has.

Change-Id: Icd7e600291f281e80f60ef857c22f22cba08bfc1
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
[mbohan: port MSM regulator drivers to new const type]
Signed-off-by: Michael Bohan <mbohan@codeaurora.org>
diff --git a/arch/arm/mach-msm/proccomm-regulator.c b/arch/arm/mach-msm/proccomm-regulator.c
index ba10d38..d1fa15e 100644
--- a/arch/arm/mach-msm/proccomm-regulator.c
+++ b/arch/arm/mach-msm/proccomm-regulator.c
@@ -196,7 +196,7 @@
 static struct regulator_dev *__devinit create_proccomm_rdev(
 	struct proccomm_regulator_info *info, struct device *parent)
 {
-	char *name;
+	const char *name;
 	struct proccomm_regulator_drvdata *d;
 	struct regulator_dev *rdev;
 	int rc = 0;