virgl: support 10-bit formats on GLES
This matches the table here:
https://www.khronos.org/registry/OpenGL-Refpages/es3.0/html/glTexImage2D.xhtml
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This matches the table here:
https://www.khronos.org/registry/OpenGL-Refpages/es3.0/html/glTexImage2D.xhtml