UBUNTU: SAUCE: i915_bpo: Drop is_preliminary from BXT/KBL.

BugLink: http://bugs.launchpad.net/bugs/1580114

We can enable these to work OOTB now.
Signed-off-by: Timo Aaltonen <timo.aaltonen@canonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Acked-by: Brad Figg <brad.figg@canonical.com>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>

ubuntu/i915/i915_drv.c

@@ -333,7 +333,6 @@ static const struct intel_device_info intel_skylake_gt3_info = {
 };
 
 static const struct intel_device_info intel_broxton_info = {
-	.is_preliminary = 1,
 	.is_broxton = 1,
 	.gen = 9,
 	.need_gfx_hws = 1, .has_hotplug = 1,
@@ -348,14 +347,12 @@ static const struct intel_device_info intel_broxton_info = {
 
 static const struct intel_device_info intel_kabylake_info = {
 	HSW_FEATURES,
-	.is_preliminary = 1,
 	.is_kabylake = 1,
 	.gen = 9,
 };
 
 static const struct intel_device_info intel_kabylake_gt3_info = {
 	HSW_FEATURES,
-	.is_preliminary = 1,
 	.is_kabylake = 1,
 	.gen = 9,
 	.ring_mask = RENDER_RING | BSD_RING | BLT_RING | VEBOX_RING | BSD2_RING,