staging: brcm80211: remove conditional BCMSDIO code from bcmsrom.c

The source file is only used by the softmac driver and will never be
compiled with the BCMSDIO flag enabled so there is no need to have code
ifdef for this flag.

Reviewed-by: Henry Ptasinski <henryp@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>