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This CL replaces the DRM specific XR30 with AR30 where
appropriate, and adds the necessary entries to support
AR30 with SCANOUT usage.

This format started being supported with the recent Mesa
uprev.

Test: forcing BGRA_1010102 as DisplaySnapshot::PrimaryFormat,
and allowing for only an opaque FB (ToT wants both opaque and
normal) the primary plane of the device is indeed XR30 as per
/sys/kernel/debug/dri/0/state).
and
 gl_unittests  --gtest_also_run_disabled_tests
and
 ozone_gl_unittests  --gtest_also_run_disabled_tests
AR30 test cases passing.

Bug: 949260
Change-Id: I852433d30a5243f682b7bb9b9e8bbb0184b1d4d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2068825
Commit-Queue: Miguel Casas <mcasas@chromium.org>
Reviewed-by: Daniel Nicoara <dnicoara@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747122}