sunxi: defaultly enable SPL for Lichee Pi Zero

As we have already DRAM initialization code for V3s SoC, we can
defaultly enable SPL now on Lichee Pi Zero.

Add CONFIG_SPL in Lichee Pi Zero defconfig.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
Reviewed-by: Jagan Teki <jagan@openedev.com>

configs/LicheePi_Zero_defconfig

@@ -4,8 +4,12 @@ CONFIG_MACH_SUN8I_V3S=y
 CONFIG_DRAM_CLK=360
 CONFIG_DRAM_ZQ=14779
 CONFIG_DEFAULT_DEVICE_TREE="sun8i-v3s-licheepi-zero"
+CONFIG_SPL=y
 # CONFIG_CMD_IMLS is not set
 # CONFIG_CMD_FLASH is not set
 # CONFIG_CMD_FPGA is not set
 # CONFIG_NETDEVICES is not set
 CONFIG_SYS_USB_EVENT_POLL_VIA_INT_QUEUE=y
+# CONFIG_SPL_DOS_PARTITION is not set
+# CONFIG_SPL_ISO_PARTITION is not set
+# CONFIG_SPL_EFI_PARTITION is not set