kernel: update bcma to version master-2014-07-29-1

This is a backport of bcma from wireless-tesing/master tag master-2014-07-29-1.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

backport: r41899


git-svn-id: svn://svn.openwrt.org/openwrt/branches/barrier_breaker@42020 3c298f89-4303-0410-b956-a3cf2f4a3e73