Revert "swapchain: support RGBX backed opaque swapchain for offs..."

Revert submission 26542013

Reason for revert: DroidMonitor: Potential culprit for Bug b/329753804 - verifying through ABTD before revert submission. This is part of the standard investigation process, and does not mean your CL will be reverted.

Reverted changes: /q/submissionid:26542013

Change-Id: I6ec4eba91fc62cd8e8ab631722fd2a9ec129aa30
1 file changed