drm/i915: Define IS_BROXTON properly.

Kabylake will also be defined as gen9 and !is_skylake.
So we need start by creating a proper Broxton
definition, otherwise we will break broxton with the
introduction of Kabylake.

Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1445966099-1640-2-git-send-email-rodrigo.vivi@intel.com
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 8873955..1f8ae09 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -765,6 +765,7 @@
 	func(is_valleyview) sep \
 	func(is_haswell) sep \
 	func(is_skylake) sep \
+	func(is_broxton) sep \
 	func(is_preliminary) sep \
 	func(has_fbc) sep \
 	func(has_pipe_cxsr) sep \
@@ -2476,7 +2477,7 @@
 #define IS_HASWELL(dev)	(INTEL_INFO(dev)->is_haswell)
 #define IS_BROADWELL(dev)	(!INTEL_INFO(dev)->is_valleyview && IS_GEN8(dev))
 #define IS_SKYLAKE(dev)	(INTEL_INFO(dev)->is_skylake)
-#define IS_BROXTON(dev)	(!INTEL_INFO(dev)->is_skylake && IS_GEN9(dev))
+#define IS_BROXTON(dev)		(INTEL_INFO(dev)->is_broxton)
 #define IS_MOBILE(dev)		(INTEL_INFO(dev)->is_mobile)
 #define IS_HSW_EARLY_SDV(dev)	(IS_HASWELL(dev) && \
 				 (INTEL_DEVID(dev) & 0xFF00) == 0x0C00)