ARM: sunxi_defconfig: enable MODULE_UNLOAD

Loadable module support is enabled so we should allow unloading
modules too. This also allows lsmod to show values other than "-2" in
the "Used by" column.
Signed-off-by: Jonathan Liu <net147@gmail.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>

arch/arm/configs/sunxi_defconfig

@@ -5,6 +5,7 @@ CONFIG_CGROUPS=y
 CONFIG_BLK_DEV_INITRD=y
 CONFIG_PERF_EVENTS=y
 CONFIG_MODULES=y
+CONFIG_MODULE_UNLOAD=y
 CONFIG_ARCH_SUNXI=y
 CONFIG_SMP=y
 CONFIG_NR_CPUS=8