wl1271: Remove circular interlocking related to the inetaddr notifier chain

Removing the wl1271 from the inet addr notifier chain sometimes causes the
registered handler to be called - causing locking problems if the removing
function is called from within the mutex.

Signed-off-by: Juuso Oikarinen <juuso.oikarinen@nokia.com>
Reviewed-by: Teemu Paasikivi <ext-teemu.3.paasikivi@nokia.com>
Signed-off-by: Luciano Coelho <luciano.coelho@nokia.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>