ssb: activate CONFIG_SSB_BLOCKIO in the kernel and not in compat-wireless.
Before this patch CONFIG_SSB_BLOCKIO was set to y in compat-wireless
but the in kernel ssb system had it set to n, this causes an invalid pointer.
b43 now needs CONFIG_SSB_BLOCKIO=y
git-svn-id: svn://svn.openwrt.org/openwrt/branches/backfire@21558 3c298f89-4303-0410-b956-a3cf2f4a3e73