Chrome makes assumptions that depend on ANGLE implementing 24bit
RGB as 32 RGBX. Since that was the behavior of ANGLE for a while,
remove those formats from the VK format table to force that behavior
again.

Test: Chrome on Fuchsia
Bug: angleproject:4282
Change-Id: I22a3f07b00d7870044ed6b3326dd528721b89af8
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2085043Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Michael Spang <spang@chromium.org>