drm/xe: Rename RC0/RC6 macros

Follow up commits will mass-remove the gen prefix/suffix. For GEN6_RC0
and GEN6_RC6 that would make the variable too short and easy to
conflict. So, add "GT_" prefix that is also part of the register name.
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/regs/xe_gt_regs.h

@@ -345,8 +345,8 @@
 
 #define GEN6_GT_CORE_STATUS			_MMIO(0x138060)
 #define   RCN_MASK				REG_GENMASK(2, 0)
-#define   GEN6_RC0				0
-#define   GEN6_RC6				3
+#define   GT_RC0				0
+#define   GT_RC6				3
 
 #define GEN6_GT_GFX_RC6_LOCKED			_MMIO(0x138104)
 #define GEN6_GT_GFX_RC6				_MMIO(0x138108)

drivers/gpu/drm/xe/xe_guc_pc.c

@@ -592,9 +592,9 @@ static ssize_t rc_status_show(struct device *dev,
 	xe_device_mem_access_put(gt_to_xe(gt));
 
 	switch (REG_FIELD_GET(RCN_MASK, reg)) {
-	case GEN6_RC6:
+	case GT_RC6:
 		return sysfs_emit(buff, "rc6\n");
-	case GEN6_RC0:
+	case GT_RC0:
 		return sysfs_emit(buff, "rc0\n");
 	default:
 		return -ENOENT;