Switch to new 8250 debug uart code because the old
mach-mcs814x/include/mach/debug-macro.S tries to include
asm/hardware/debug-8250.S which no longer exists since kernel 3.14
Signed-off-by: Günther Kelleter <guenther.kelleter@devolo.de>
Backport of r46646
git-svn-id: svn://svn.openwrt.org/openwrt/branches/chaos_calmer@47192 3c298f89-4303-0410-b956-a3cf2f4a3e73