ramips: remove top-level {address,size}-cells properties from .dts files

Those are defined in the SoC specific .dtsi files.

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@36237 3c298f89-4303-0410-b956-a3cf2f4a3e73