ltq-deu: add missing dependency

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37439 3c298f89-4303-0410-b956-a3cf2f4a3e73
kernel: add missing module for mmc-spi

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37440 3c298f89-4303-0410-b956-a3cf2f4a3e73