net: wireless: bcmdhd: Use powersuspend to prevent panic

* Currently code is checking for deprecated early suspend
  which we don't have 3.4 onwards.
* So helper function is called for checking suspend status.
* This is causing race condition if screen is turned on and off
  rapidly.

Happy Case:
Screen Off -> Wifi Suspended -> Screen On -> Wifi Resumed

Race conditon:
Screen Off -> Wifi Suspended -> Screen On -> Wifi Resumed
-> Screen Off -> Screen On (rapid) -> Wifi Suspended!!

This causes watchdog bark / kernel panic as below:

[ 7217.522130] PM: noirq resume of devices complete after 4.327 msecs
[ 7217.527345] PM: early resume of devices complete after 2.901 msecs
[ 7217.549827] PM: resume of devices complete after 22.455 msecs
[ 7217.551660] Restarting tasks ... done.
[ 7217.558636] PM: suspend exit 2014-05-28 06:29:43.989676647 UTC
[ 7221.016418] [Touch] touch on
[ 7221.217701] mdss_dsi_panel_on
[ 7221.267290] lm3630_backlight_on
[ 7221.292473] dhd_set_suspend: Remove extra suspend setting
[ 7225.155909] lm3630_backlight_off
[ 7225.231024] [prevent_touchscreen_sleep]: payload = 10
[ 7225.383173] mdss_dsi_panel_off:
[ 7225.406145] [Touch] touch off
[ 7226.303258] [Touch] touch on
[ 7226.497452] mdss_dsi_panel_on
[ 7227.373713] [prevent_touchscreen_sleep]: payload = 10
[ 7227.525721] mdss_dsi_panel_off:
[ 7227.548667] [Touch] touch off
[ 7229.718552] [Touch] touch on
[ 7229.917659] mdss_dsi_panel_on
[ 7235.208821] dhd_set_suspend: force extra Suspend setting
[ 7235.220861] dhd_get_suspend_bcn_li_dtim beacon=100 bcn_li_dtim=3 DTIM=1 Listen=10
[ 7241.483289] Watchdog bark! Now = 7241.483285
[ 7241.483342] Watchdog last pet at 7220.296271
[ 7241.483428] cpu alive mask from last pet 0
[ 7241.483474] Causing a watchdog bite! IRQ = 35.

No errors detected
Boot info:
Last boot reason: wdog_bark

Let's use powersuspend driver replacing deprecated earlysuspend drivers.

CAUTION: Powersuspend driver shouldn't use screen on/off hooks else this
         patch is of no use!! If you really want screen on/off level of
         sensitivity, use LCD notifier for such drivers.

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>