staging: brcm80211: power save issue fixed in brcmfmac driver

brcmfmac driver is getting request for enabling power save
before the interface is up. With the earlier implementation,
this request used to fail resulting out of sync power save
state between cfg80211 & brcmfmac driver. With this fix,
power save state is stored in configuration parameters and
will be used while initializing the adapter.

Signed-off-by: Sukesh Srikakula <sukeshs@broadcom.com>
Reviewed-by: Roland Vossen <rvossen@broadcom.com>
Reviewed-by: Arend van Spriel <arend@broadcom.com>
Reviewed-by: Franky Lin <frankyl@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>