staging: brcm80211: remove flash related code from initvars_srom_pci()

The function initvars_srom_pci() has fallback to obtain drivers settings
from flash when no srom device is present. However, this driver does not
support flash so the fallback code 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>