regulator: Define full constraints function with REGULATOR disabled

This allows machine drivers to build without ifdefs if they have
full constraints. Suggested by machine drivers contributed by
Haojian Zhuang <haojian.zhuang@gmail.com>.

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Liam Girdwood <lrg@slimlogic.co.uk>
diff --git a/include/linux/regulator/machine.h b/include/linux/regulator/machine.h
index 9328090..73a88f6 100644
--- a/include/linux/regulator/machine.h
+++ b/include/linux/regulator/machine.h
@@ -171,6 +171,12 @@
 
 int regulator_suspend_prepare(suspend_state_t state);
 
+#ifdef CONFIG_REGULATOR
 void regulator_has_full_constraints(void);
+#else
+static inline void regulator_has_full_constraints(void)
+{
+}
+#endif
 
 #endif