drm/i915: Rename and expose common GT early init routine

The common early GT init is needed for initialization of all GT types
(root/primary, remote tile, standalone media).  Since standalone media
(coming in a future patch) will be implemented in a separate file,
rename and expose the function for use.
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220906234934.3655440-7-matthew.d.roper@intel.comSigned-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

drivers/gpu/drm/i915/gt/intel_gt.c

@@ -34,7 +34,7 @@
 #include "intel_uncore.h"
 #include "shmem_utils.h"
 
-static void __intel_gt_init_early(struct intel_gt *gt)
+void intel_gt_common_init_early(struct intel_gt *gt)
 {
 	spin_lock_init(&gt->irq_lock);
 
@@ -64,7 +64,7 @@ void intel_root_gt_init_early(struct drm_i915_private *i915)
 	gt->i915 = i915;
 	gt->uncore = &i915->uncore;
 
-	__intel_gt_init_early(gt);
+	intel_gt_common_init_early(gt);
 }
 
 static int intel_gt_probe_lmem(struct intel_gt *gt)
@@ -788,7 +788,7 @@ static int intel_gt_tile_setup(struct intel_gt *gt, phys_addr_t phys_addr)
 
 		gt->uncore = uncore;
 
-		__intel_gt_init_early(gt);
+		intel_gt_common_init_early(gt);
 	}
 
 	intel_uncore_init_early(gt->uncore, gt);

drivers/gpu/drm/i915/gt/intel_gt.h

@@ -44,6 +44,7 @@ static inline struct intel_gt *gsc_to_gt(struct intel_gsc *gsc)
 	return container_of(gsc, struct intel_gt, gsc);
 }
 
+void intel_gt_common_init_early(struct intel_gt *gt);
 void intel_root_gt_init_early(struct drm_i915_private *i915);
 int intel_gt_assign_ggtt(struct intel_gt *gt);
 int intel_gt_init_mmio(struct intel_gt *gt);