brcm63xx: hack around jffs2 corruption with SMP

mempy_fromio seems to be randomly failing when the destination is
unaligned; work around it by forcing the name to be aligned in memory.

Should fix jffs2 and SMP for now, but needs to be some additional
looking into as it does not fix the source.

Signed-off-by: Jonas Gorski <jogo@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@40396 3c298f89-4303-0410-b956-a3cf2f4a3e73