pinctrl: sunxi: add A20 support to A10 driver

As A20 is designed as a pin-compatible upgrade of A10, their pin
controller are very similar, and can share one driver.

Add A20 support to the A10 driver.
Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/pinctrl/sunxi/Kconfig

@@ -7,7 +7,7 @@ config PINCTRL_SUNXI
 	select GPIOLIB
 
 config PINCTRL_SUN4I_A10
-	def_bool MACH_SUN4I
+	def_bool MACH_SUN4I || MACH_SUN7I
 	select PINCTRL_SUNXI
 
 config PINCTRL_SUN5I
@@ -24,7 +24,7 @@ config PINCTRL_SUN6I_A31_R
 	select PINCTRL_SUNXI
 
 config PINCTRL_SUN7I_A20
-	def_bool MACH_SUN7I
+	bool
 	select PINCTRL_SUNXI
 
 config PINCTRL_SUN8I_A23