drm/i915/guc: Use GUC prefix for CORE_FAMILY definitions

Almost all other GuC fw definitions are using GUC|guc prefix.
While around, in get_core_family() change explicit WARN into MISSING_CASE
as it looks more appropriate, since GuC support capability we are controlling
by intel_device_info.has_guc flag.
Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170404133836.125736-1-michal.wajdeczko@intel.comReviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

drivers/gpu/drm/i915/intel_guc_fwif.h

@@ -23,8 +23,8 @@
 #ifndef _INTEL_GUC_FWIF_H
 #define _INTEL_GUC_FWIF_H
 
-#define GFXCORE_FAMILY_GEN9		12
-#define GFXCORE_FAMILY_UNKNOWN		0x7fffffff
+#define GUC_CORE_FAMILY_GEN9		12
+#define GUC_CORE_FAMILY_UNKNOWN		0x7fffffff
 
 #define GUC_CLIENT_PRIORITY_KMD_HIGH	0
 #define GUC_CLIENT_PRIORITY_HIGH	1

drivers/gpu/drm/i915/intel_guc_loader.c

@@ -86,11 +86,11 @@ static u32 get_core_family(struct drm_i915_private *dev_priv)
 
 	switch (gen) {
 	case 9:
-		return GFXCORE_FAMILY_GEN9;
+		return GUC_CORE_FAMILY_GEN9;
 
 	default:
-		WARN(1, "GEN%d does not support GuC operation!\n", gen);
-		return GFXCORE_FAMILY_UNKNOWN;
+		MISSING_CASE(gen);
+		return GUC_CORE_FAMILY_UNKNOWN;
 	}
 }