mesa: GetTexLevelParameter{if}v changes for OpenGL ES 3.1

mesa: GetTexLevelParameter{if}v changes for OpenGL ES 3.1

Patch refactors existing parameters check to first check common enums
between desktop GL and GLES 3.1 and modifies get_tex_level_parameter_image
to be compatible with enums specified in 3.1.

v2: remove extra is_gles31() checks (suggested by Ilia)

Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Anuj Phogat <anuj.phogat@gmail.com> (v1)
Reviewed-by: Marta Lofstedt <marta.lofstedt@intel.com> (v1)
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>