sunxi: Enable AXP221s in I2C mode with the R40 SoC

The R40 SoC uses the AXP221s in I2C mode to supply power.

Some regulator's common usages have changed, and also the recommended
voltage for existing usages have changed. Update the defaults to match.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
diff --git a/board/sunxi/Kconfig b/board/sunxi/Kconfig
index 3df7077..f40b8ff 100644
--- a/board/sunxi/Kconfig
+++ b/board/sunxi/Kconfig
@@ -473,7 +473,7 @@
 
 config I2C0_ENABLE
 	bool "Enable I2C/TWI controller 0"
-	default y if MACH_SUN4I || MACH_SUN5I || MACH_SUN7I
+	default y if MACH_SUN4I || MACH_SUN5I || MACH_SUN7I || MACH_SUN8I_R40
 	default n if MACH_SUN6I || MACH_SUN8I
 	select CMD_I2C
 	---help---