sunxi: Fix wrong serial console setup in Forfun Q88DB tablet

The Forfun Q88DB tablet was unbootable since commit
b6006baf ("sunxi: Move all
boards to the driver-model"). Appears that this is caused
by the wrong serial console setup in the SPL. The serial
console should use PG3/PG4 pins according to the FEX file.
Signed-off-by: NSiarhei Siamashka <siarhei.siamashka@gmail.com>
Acked-by: NHans de Goede <hdegoede@redhat.com>
Signed-off-by: NHans de Goede <hdegoede@redhat.com>

configs/forfun_q88db_defconfig

@@ -13,7 +13,7 @@ CONFIG_VIDEO_LCD_BL_PWM="PB2"
 CONFIG_DEFAULT_DEVICE_TREE="sun5i-a13-forfun-q88db"
 # CONFIG_SYS_MALLOC_CLEAR_ON_INIT is not set
 CONFIG_SPL=y
-CONFIG_SYS_EXTRA_OPTIONS="AXP209_POWER"
+CONFIG_SYS_EXTRA_OPTIONS="CONS_INDEX=2,AXP209_POWER"
 # CONFIG_CMD_IMLS is not set
 # CONFIG_CMD_FLASH is not set
 # CONFIG_CMD_FPGA is not set