Revert "drm/mediatek: init RDMA with valid buffer"

This reverts commit 3b1f4b189cf6f057f360b04c2e4ede4506019888.

The initialization change breaks the DSI pipeline.

Change-Id: I8a1e0ccf4c7a8b32bd5b76c35fd9e10726bce320
1 file changed