mesa/teximage: add TEXTURE_CUBE_MAP_ARRAY target for CompressedTexImage3D

mesa/teximage: add TEXTURE_CUBE_MAP_ARRAY target for CompressedTexImage3D

From section 8.7, page 179 of OpenGL ES 3.2 spec:

  An INVALID_OPERATION error is generated by CompressedTexImage3D
  if internalformat is one of the the formats in table 8.17 and target
  is not TEXTURE_2D_ARRAY, TEXTURE_CUBE_MAP_ARRAY or TEXTURE_3D.

  An INVALID_OPERATION error is generated by CompressedTexImage3D if
  internalformat is TEXTURE_CUBE_MAP_ARRAY and the “Cube Map Array”
  column of table 8.17 is not checked, or if internalformat is
  TEXTURE_3D and the “3D Tex.” column of table 8.17 is not checked.

So far it was only considering TEXTURE_2D_ARRAY as valid target. But as
"Cube Map Array" column is checked for all the cases, in practice we can
consider also TEXTURE_CUBE_MAP_ARRAY.

This fixes KHR-GLES32.core.texture_cube_map_array.etc2_texture

Reviewed-by: Nanley Chery <nanley.g.chery@intel.com>