configs: sunxi: licheepi_nano: enable D-Cache

As the compile error when D-Cache is enabled is gone, we can have
D-Cache enabled now.

Signed-off-by: Icenowy Zheng <uwu@icenowy.me>
Reviewed-by: Andre Przywara <andre.przywara@arm.com>
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
diff --git a/configs/licheepi_nano_defconfig b/configs/licheepi_nano_defconfig
index 14e6bcd..92c04bd 100644
--- a/configs/licheepi_nano_defconfig
+++ b/configs/licheepi_nano_defconfig
@@ -1,7 +1,6 @@
 CONFIG_ARM=y
 CONFIG_SKIP_LOWLEVEL_INIT_ONLY=y
 CONFIG_SPL_SKIP_LOWLEVEL_INIT_ONLY=y
-CONFIG_SYS_DCACHE_OFF=y
 CONFIG_ARCH_SUNXI=y
 CONFIG_DEFAULT_DEVICE_TREE="suniv-f1c100s-licheepi-nano"
 CONFIG_SPL=y