overlay: MdssRot: Clear orientation values in setTransform.

We cleared the values after MSMFB_OVERLAY_SET, which could cause dumpsys
to not show them.
Clear the values in setTransfrom, before applying incoming values.

Change-Id: Icf2244a0ea7f2cae5d8f1b8c5e2f4cbecbe3ce3f
1 file changed