i965: Disable regular fast-clears (CCS_D) on gen9+
This partially reverts commit 3e57e949 which caused a bunch of GPU hangs on several Source titles. To date, we have no clue why these hangs are actually happening. This undoes the final effect of 3e57e949 and gets us back to not hanging. Tested with Team Fortress 2. Reviewed-by:Kenneth Graunke <kenneth@whitecape.org> Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102435 Fixes: 3e57e949 Cc: mesa-stable@lists.freedesktop.org