wakelock: remove redundant sys_sync call in suspend

wakelock: remove redundant sys_sync call in suspend

BZ: 36230

Redundant call to sys_sync() in wakelock.c

In wakelock.c@suspend()

suspend()->sys_sync()->pm_suspend()->enter_suspend()->sys_sync()

hence it is duplicate can be removed.

Change-Id: Ic558803d66694f89fa444fa264acf08943d456ba
Signed-off-by: Illyas Mansoor <illyas.mansoor@intel.com>
Reviewed-on: http://android.intel.com:8080/48682
Reviewed-by: Popescu, CatalinX <catalinx.popescu@intel.com>
Reviewed-by: Gross, Mark <mark.gross@intel.com>
Reviewed-by: Yang, Fei <fei.yang@intel.com>
Tested-by: Martin, LoicX <loicx.martin@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>