pinctrl: sunxi: Add SoC ID definitions for A10, A20 and R40 SoCs

Allwinner A10, A20 and R40 SoCs have similar GPIO layout.

Add SoC definitions in pinctrl-sunxi.h, in order to merge A20 support
into A10 driver, and add R40 support into it.
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/pinctrl-sunxi.h

@@ -87,6 +87,9 @@
 #define PINCTRL_SUN5I_GR8	BIT(3)
 #define PINCTRL_SUN6I_A31	BIT(4)
 #define PINCTRL_SUN6I_A31S	BIT(5)
+#define PINCTRL_SUN4I_A10	BIT(6)
+#define PINCTRL_SUN7I_A20	BIT(7)
+#define PINCTRL_SUN8I_R40	BIT(8)
 
 struct sunxi_desc_function {
 	unsigned long	variant;