staging: brcm80211: remove usage of pcicfg.h from brcmsmac driver

All PCI related definitions needed by the brcmsmac driver are going to
be consolidated in single header file nicpci.h. This commit removes
need to include pcicfg.h in brcmsmac driver sources.

Signed-off-by: Arend van Spriel <arend@broadcom.com>
Reviewed-by: Roland Vossen <rvossen@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>