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Sysmem now supports R8 and R8G8 image formats, so it can be used to
back R8 and R8G8 GpuMemoryBuffers.
Also disabled CPU-accessile buffers on X64 because these are not
compatible with Goldfish Vulkan drivers yet (Swiftshader doesn't support
linear image layout).

Bug: 1141538
Change-Id: Ic16e491239679541f90bddcde0060a801c73e13d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2522673
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826631}