[Graphics]: Enable the LEX command mode DSTB,CABC, fix the tearing issue

[Graphics]: Enable the LEX command mode DSTB,CABC, fix the tearing issue

BZ: 40910

Enable the LEX command mode DSTB support, add dynamic interface to
control CABC(enable the CABC default).
Disable CABC: echo 0 > /sys/module/gfx/parameters/psb_enable_lex_cabc

The root cause of commad mode tearing is DC writing the panel internal mem with direction
bottom to top while the panel scan the internal mem with direction top to bottom.

Change-Id: Ieae5298cad716a04e4a028dbf1d1e09e3325c350
Signed-off-by: yifei.xue <yifeix.xue@intel.com>
Reviewed-on: http://android.intel.com:8080/52416
Reviewed-by: Xu, Randy <randy.xu@intel.com>
Tested-by: Tong, BoX <box.tong@intel.com>
Reviewed-by: buildbot <buildbot@intel.com>
Tested-by: buildbot <buildbot@intel.com>