i965: Enable ES 3.2 on Skylake.
i965: Enable ES 3.2 on Skylake.

It's already advertised because the version.c extension checks are
fulfilled, but we didn't actually claim support, so trying to create
a ES 3.2 context would fail.

It's all done, and the CTS results look good, so let's turn it on.

Signed-off-by: Kenneth Graunke <bd2562f754ec92342f93f61c25d731e290a2ffa8@whitecape.org>
Reviewed-by: Matt Turner <789b315743a28dd066a4ba1459c35951c291d8a6@gmail.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler