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RGBX_8888 shall be used as buffer format with images without alpha. However,
Chromium doesn't allow it to use for scanout in some parts of the code,
and allows to use in other.

Thus, temporarily disable usage of RGBX_8888 and always use either RGBA or
BGRA_8888 for images with alpha and no alpha.

Bug: 1128997
Change-Id: I4a3a8ad102d46d6dc12ccaba4cbade41432d6b49
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2434928
Auto-Submit: Maksim Sisov (GMT+3) <msisov@igalia.com>
Commit-Queue: Peng Huang <penghuang@chromium.org>
Reviewed-by: Peng Huang <penghuang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811220}