i965: Workaround the gen9 hw astc5x5 sampler bug

gen9 hardware has a bug in the sampler cache that can cause GPU hangs
whenever an texture with aux compression enabled is in the sampler cache
together with an ASTC5x5 texture.  Because we can't control what the
client binds at any given time, we have two options: resolve the CCS or
decompresss the ASTC.  Doing a CCS or HiZ resolve is far less drastic
and will likely have a smaller performance impact.

Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Tested-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Topi Pohjolainen <topi.pohjolainen@intel.com>
(cherry picked from commit f9e630e2)