sunxi: Fix DCDC2 output in CHIP_defconfig

Unlike the datasheet recommendation, the R8 SoC requires a 1.4V supply
for its CPU when operating at 1Ghz.

Rely on the default value specified in the Kconfig entry.

Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
diff --git a/configs/CHIP_defconfig b/configs/CHIP_defconfig
index 950c803..0f4020b 100644
--- a/configs/CHIP_defconfig
+++ b/configs/CHIP_defconfig
@@ -10,7 +10,6 @@
 CONFIG_SYS_EXTRA_OPTIONS="CONS_INDEX=2"
 # CONFIG_CMD_IMLS is not set
 CONFIG_CMD_GPIO=y
-CONFIG_AXP_DCDC2_VOLT=1300
 CONFIG_AXP_ALDO3_VOLT=3300
 CONFIG_AXP_ALDO4_VOLT=3300
 CONFIG_USB_MUSB_GADGET=y