mfd: axp20x: use explicit bit defines

The AXP20X_OFF define is an actual specific bit, define it as such.
Signed-off-by: Olliver Schinagl <oliver@schinagl.nl>
Signed-off-by: Priit Laes <plaes@plaes.org>
Acked-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Mark Brown <broonie@kernel.org>

drivers/mfd/axp20x.c

@@ -30,7 +30,7 @@
 #include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
 
-#define AXP20X_OFF	0x80
+#define AXP20X_OFF	BIT(7)
 
 #define AXP806_REG_ADDR_EXT_ADDR_MASTER_MODE	0
 #define AXP806_REG_ADDR_EXT_ADDR_SLAVE_MODE	BIT(4)