regulator: add regulator_can_change_voltage stub

When CONFIG_REGULATOR is not set, we cannot call regulator_can_change_voltage() from a device driver, which results in a build error like

video/fbdev/omap2/dss/hdmi5.c: In function 'hdmi_init_regulator':
video/fbdev/omap2/dss/hdmi5.c:149:2: error: implicit declaration of function 'regulator_can_change_voltage' [-Werror=implicit-function-declaration]

even for drivers that don't require the regulator API normally. Such a use was recently added in the omap2+ hdmi driver.

This avoids the problem by adding a static inline function stub in the API header, as we have for most of the other regulator functions as well.

index a2d9d81..14ec18d 100644
@@ -395,6 +395,11 @@ static inline void regulator_bulk_free(int num_consumers,
 {
 }
 
+static inline int regulator_can_change_voltage(struct regulator *regulator)
+{
+	return 0;
+}
+
 static inline int regulator_set_voltage(struct regulator *regulator,
 					int min_uV, int max_uV)
 {

Applied, thanks.
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