This partially reverts r44577 ("brcm63xx: fix DTS LEDs and buttons").

Fixes #19858.

Backport of r46149.
Signed-off-by: Jonas Gorski <jogo@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/branches/chaos_calmer@46154 3c298f89-4303-0410-b956-a3cf2f4a3e73