STAGING: brcm80211 v2 keep power on in suspend state

Keep WIFI power on during suspend.

Consumes 10s of milliwatts but avoids having to reload firmware
on resume. Tested on tegra2_seaboard.

Signed-off-by: Venkat Rao <vrao@broadcom.com>
Tested-by: Grant Grundler <grundler@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>