staging: brcm80211: remove pci core defintion files

The source file nicpci.c is the only file left which needs the
pci core register definitions. These definitions have been added
to the source file so the include files can be removed.

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>