wl1271: Fixed unloading of the wl1271_sdio module

Fixed two bugs causing problems when unloding wl1271 module. First was
missing sdio_set_drvdata call from the probe function, second was order
of function calls in the remove function.

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