CHROMIUM: Reset tree to upstream/mesa-21.2.3

No patches on our side: clean tree.

BUG=b:197031256
TEST=graphics_parallel_dEQP on volteer.
     passes gles2, gles3, gles31
     fails vk* with 174, 180, 183, 182 failures each

Change-Id: Ic7a2eb7ea9d1c4d188c9898af7cf4f457b826c4a