mvebu: remove forced module config

These should either be disabled or not present in the config, else
they might cause build issues because of unexpected unpackaged
modules, as it is the case for LEDS_CLASS.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@39529 3c298f89-4303-0410-b956-a3cf2f4a3e73