move both asus boards to asus.mk
rename HW5503G profile to HW550-3G to match name in image/Makefile
(fixes#16599)
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@41271 3c298f89-4303-0410-b956-a3cf2f4a3e73