mdss: No pan idle for overlay vsync control

The other vsync control ioctl isn't used, make sure both ioctls
do not call the "pan_idle" function

Signed-off-by: Naseer Ahmed <naseer@codeaurora.org>
(cherry picked from commit 2d7b53a81335b57a16a75ec0990d7fb598f4ddc9)

Change-Id: I75cef2e4c31493c9efd68a2099f7621eb7ab5a91
1 file changed