brcmsmac: disable power-save related functions

brcmsmac: disable power-save related functions

This patch fixes a regression introduced by:

  commit 81d3ef3142da4e886113c8cbe5a0162501155944
  Author: Hauke Mehrtens <hauke@hauke-m.de>
  Date:   Sun Mar 24 01:45:52 2013 +0100

      brcmsmac: remove brcms_bss_cfg->associated

The regression behaviour was described on mailing list.

http://mid.gmane.org/5197DC4F.7030503@broadcom.com:
"On laptop I installed kernel with brcmsmac compiled as
module. It comes up and associates during boot, but after
logging in there is no connectivity. Triggering reassoc
gives connectivity for some time, but after a while (1-2 min)
it stops."

Before the mentioned commit the return value of
the function brcms_c_ps_allowed() was always false,
which is desired behaviour as power-save is not
supported at the moment. Therefor, the function is
changed to just return false instead of simply
reverting the mentioned commit.

Bug: 58471 <https://bugzilla.kernel.org/show_bug.cgi?id=58471>

Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>