drm/i915/uc: Drop use of MISSING_CASE on trivial enums

We can rely on compiler to notify us if we miss any case.
This approach may also reduce driver size (reported ~4K).

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170331102652.177664-1-michal.wajdeczko@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_uc.h

@@ -114,10 +114,8 @@ const char *intel_uc_fw_status_repr(enum intel_uc_fw_status status)
 		return "PENDING";
 	case INTEL_UC_FIRMWARE_SUCCESS:
 		return "SUCCESS";
-	default:
-		MISSING_CASE(status);
-		return "<invalid>";
 	}
+	return "<invalid>";
 }
 
 enum intel_uc_fw_type {
@@ -133,10 +131,8 @@ static inline const char *intel_uc_fw_type_repr(enum intel_uc_fw_type type)
 		return "GuC";
 	case INTEL_UC_FW_TYPE_HUC:
 		return "HuC";
-	default:
-		MISSING_CASE(type);
-		return "<invalid>";
 	}
+	return "uC";
 }
 
 /*