ARM: sunxi_defconfig: Update MFD_AXP20X symbol and enable MFD_AXP20X_RSB

axp20x support has been split into 2 parts, I2C and RSB interface
variants.

Update the MFD_AXP20X symbol for I2C support, and also enable
MFD_AXP20X_RSB to support RSB variants.

Keep MFD_AXP20X enabled for now, to ease migration for automated boot
farms while the patches are being merged. This should be removed in the
next release.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/configs/sunxi_defconfig

@@ -89,6 +89,8 @@ CONFIG_CPU_THERMAL=y
 CONFIG_WATCHDOG=y
 CONFIG_SUNXI_WATCHDOG=y
 CONFIG_MFD_AXP20X=y
+CONFIG_MFD_AXP20X_I2C=y
+CONFIG_MFD_AXP20X_RSB=y
 CONFIG_REGULATOR=y
 CONFIG_REGULATOR_FIXED_VOLTAGE=y
 CONFIG_REGULATOR_AXP20X=y