lantiq: add device tree support for arv4519pw

Signed-off-by: Luka Perkov <luka@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37178 3c298f89-4303-0410-b956-a3cf2f4a3e73
gcc: do not delete DATESTAMP and DEV-PHASE version info (fixes __GLIBCXX__ definition)

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

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37179 3c298f89-4303-0410-b956-a3cf2f4a3e73