virgl: support emulating planar image sampling

Merged David Stevens requested to merge dgstevens/mesa:plane-sample-view into master

Mesa emulates planar format sampling with per-plane samplers. Virgl now supports this by allowing the plane index to be passed when creating a sampler view from a planar image. With this change, mesa now passes that information to virgl.

Signed-off-by: David Stevens stevensd@chromium.org

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