staging: brcm80211: remove unsupported chipset code from brcmsmac phy

the phy sources contained some code fragments for chipsets that are not
supported by this driver, which have been 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>