libexternal: Call new IOCTL to commit on external display

From post() for external call the new ioctl MSMFB_OVERLAY_COMMIT
to update the external display.

The new IOCTL is faster than the default PAN and waits for DMAE to finish before
returning. This fixes tearing.

Bug: 7249589

Acked-by: Arun Kumar K.R <akumarkr@codeaurora.org>
Change-Id: Ic755e634d5f141a567c7d93f39c74bb087cd7044
1 file changed