ramips: Fix dts typos

Signed-off-by: Roman Yeryomin <roman@advem.lv>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38959 3c298f89-4303-0410-b956-a3cf2f4a3e73
ramips: Fix initial network configuration for few boards

Argus ATP52B:      ethernet didn't work because of unconfigured switch
Sparklan WCR150GN: add switch config and make single port to be LAN
Dlink DIR-645:     seems to be a redundant case

Signed-off-by: Roman Yeryomin <roman@advem.lv>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38960 3c298f89-4303-0410-b956-a3cf2f4a3e73