brcm80211: smac: change attach interfaces in main.c for bcma support

The driver is probed through bcma which provides a device representing
the core. This device is now passed in brcms_c_attach and brcms_b_attach
functions.

Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Alwin Beukers <alwin@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Franky Lin <frankyl@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>