drm/i915/gt: remove stray declaration of intel_gt_release_all()

When intel_gt_release_all() was removed from the code in commit
e899505 ("drm/i915: do not clean GT table on error path"), its
declaration in the header file remained.  Remove it.

Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Reviewed-by: Jonathan Cavitt <jonathan.cavitt@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240813140618.387553-1-luciano.coelho@intel.com

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

@@ -174,7 +174,6 @@ static inline bool intel_gt_is_wedged(const struct intel_gt *gt)
 
 int intel_gt_probe_all(struct drm_i915_private *i915);
 int intel_gt_tiles_init(struct drm_i915_private *i915);
-void intel_gt_release_all(struct drm_i915_private *i915);
 
 #define for_each_gt(gt__, i915__, id__) \
 	for ((id__) = 0; \