r600: Add R4G4B4A4 and A1B5G5R5 to supported vertex formats

r600: Add R4G4B4A4 and A1B5G5R5 to supported vertex formats

Below tests would fail with an error message
  "Vertex format (R4G4B4A4|R5G5B5A1) not supported."
Add the formate to the translation routine to enable these formats.

Fixes:
  dEQP-GLES3.functional.texture.specification.teximage2d_pbo.rgba4_2d
  dEQP-GLES3.functional.texture.specification.teximage2d_pbo.rgba4_cube
  dEQP-GLES3.functional.texture.specification.teximage2d_pbo.rgb5_a1_2d
  dEQP-GLES3.functional.texture.specification.teximage2d_pbo.rgb5_a1_cube
  dEQP-GLES3.functional.texture.specification.texsubimage2d_pbo.rgba4_2d
  dEQP-GLES3.functional.texture.specification.texsubimage2d_pbo.rgba4_cube
  dEQP-GLES3.functional.texture.specification.texsubimage2d_pbo.rgb5_a1_2d
  dEQP-GLES3.functional.texture.specification.texsubimage2d_pbo.rgb5_a1_cube
  dEQP-GLES3.functional.texture.specification.teximage3d_pbo.rgba4_2d_array
  dEQP-GLES3.functional.texture.specification.teximage3d_pbo.rgba4_3d
  dEQP-GLES3.functional.texture.specification.teximage3d_pbo.rgb5_a1_2d_array
  dEQP-GLES3.functional.texture.specification.teximage3d_pbo.rgb5_a1_3d
  dEQP-GLES3.functional.texture.specification.texsubimage3d_pbo.rgba4_2d_array
  dEQP-GLES3.functional.texture.specification.texsubimage3d_pbo.rgba4_3d
  dEQP-GLES3.functional.texture.specification.texsubimage3d_pbo.rgb5_a1_2d_array
  dEQP-GLES3.functional.texture.specification.texsubimage3d_pbo.rgb5_a1_3d
Signed-off-by: Gert Wollny <gw.fossdev@gmail.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>