Fix modprobe path for pppoatm

Without netifd generates an error:

daemon.notice netifd: wan (1249): /bin/sh: /sbin/modprobe: not found

Signed-off-by: Cezary Jackiewicz <cezary.jackiewicz@gmail.com>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38732 3c298f89-4303-0410-b956-a3cf2f4a3e73
lantiq: DGN3500 fixups

Just fixing up a few things for the Netgear DGN3500.

Signed-off-by: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38733 3c298f89-4303-0410-b956-a3cf2f4a3e73