drm/xe/gt: Enable interrupt while initializing root gt

At present the interrupts are enabled while initializing the last GT.
But this is incorrect for a Multi-GT platform, as root GT initialization
will fail with interrupt disabled. Interrupts are required for
the GuC submission triggered during initialization.
Enable the interrupt during the root GT initialization.
Signed-off-by: Balasubramani Vivekanandan <balasubramani.vivekanandan@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

drivers/gpu/drm/xe/xe_irq.c

@@ -334,7 +334,7 @@ static void dg1_irq_postinstall(struct xe_device *xe, struct xe_gt *gt)
 	GEN3_IRQ_INIT(gt, GEN11_GU_MISC_, ~GEN11_GU_MISC_GSE,
 		      GEN11_GU_MISC_GSE);
 
-	if (gt->info.id + 1 == xe->info.tile_count)
+	if (gt->info.id == XE_GT0)
 		dg1_intr_enable(xe, true);
 }