drm/i915/gen9: Add WaVFEStateAfterPipeControlwithMediaStateClear

drm/i915/gen9: Add WaVFEStateAfterPipeControlwithMediaStateClear

Kernel only need to add a register to HW whitelist, required for a
preemption related issue.

Reference: HSD#2131039
Reviewed-by: Jeff McGee <jeff.mcgee@intel.com>
Signed-off-by: Arun Siluvery <arun.siluvery@linux.intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1465203169-16591-1-git-send-email-arun.siluvery@linux.intel.com
(cherry picked from commit 6bb6285582e0cf9b3a8440e0e714aae5f66d9ce2)
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>