glsl: Mark cube map array sampler types as reserved in GLSL ES 3.10

glsl: Mark cube map array sampler types as reserved in GLSL ES 3.10

All the GLSL 4.x keywords were added to the list of reserved keywords
in GLSL ES 3.10.  As far as I can tell, these are the only ones that
were missed.

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
(cherry picked from commit c879dbc4e4184511cb3d831b66380c087216d850)