regmap: merge regmap_update_bits_async() into macro

Current regmap has many similar update functions like below,
but the difference is very few.
	regmap_update_bits()
	regmap_update_bits_async()
	regmap_update_bits_check()
	regmap_update_bits_check_async()
Furthermore, we can add *force* write option too in the future.

This patch merges regmap_update_bits_async() into macro
by using regmap_update_bits_base().

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index 500b36c..90c8b0e 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -67,6 +67,8 @@
 
 #define	regmap_update_bits(map, reg, mask, val) \
 	regmap_update_bits_base(map, reg, mask, val, NULL, false, false)
+#define	regmap_update_bits_async(map, reg, mask, val)\
+	regmap_update_bits_base(map, reg, mask, val, NULL, true, false)
 
 #ifdef CONFIG_REGMAP
 
@@ -699,8 +701,6 @@
 			    bool *change, bool async, bool force);
 int regmap_write_bits(struct regmap *map, unsigned int reg,
 		       unsigned int mask, unsigned int val);
-int regmap_update_bits_async(struct regmap *map, unsigned int reg,
-			     unsigned int mask, unsigned int val);
 int regmap_update_bits_check(struct regmap *map, unsigned int reg,
 			     unsigned int mask, unsigned int val,
 			     bool *change);
@@ -956,14 +956,6 @@
 	return -EINVAL;
 }
 
-static inline int regmap_update_bits_async(struct regmap *map,
-					   unsigned int reg,
-					   unsigned int mask, unsigned int val)
-{
-	WARN_ONCE(1, "regmap API is disabled");
-	return -EINVAL;
-}
-
 static inline int regmap_update_bits_check(struct regmap *map,
 					   unsigned int reg,
 					   unsigned int mask, unsigned int val,