ssb: unregister gpios before unloading ssb

This patch unregisters the gpio chip before ssb gets unloaded.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --cc drivers/ssb/driver_gpio.c
Simple merge

diff --cc drivers/ssb/main.c
Simple merge

diff --cc drivers/ssb/ssb_private.h
Simple merge