mesa: add missing formats to driGLFormatToImageFormat

Fixes following dEQP tests:

   dEQP-EGL.functional.image.api.create_image_gles2_tex2d_luminance
   dEQP-EGL.functional.image.api.create_image_gles2_tex2d_luminance_alpha

Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=98328
1 file changed