i965/hsw: Apply non-msrt fast color clear w/a to all HSW GTs

Pre-patch, the workaround was applied to only HSW GT3. However, the
workaround also fixes render corruption on the HSW GT1 Chromebook,
codenamed Falco.

CC: Anuj Phogat <anuj.phogat@gmail.com>
CC: Paul Berry <stereotype441@gmail.com>
OTC-Tracker: CHRMOS-812
Signed-off-by: Chad Versace <chad.versace@linux.intel.com>