drm/i915: remove a couple of superfluous i915_drm.h includes

Remove a couple of unnecessary includes.
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230117123856.2271720-1-jani.nikula@intel.com

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

@@ -6,7 +6,6 @@
 #include "intel_ggtt_gmch.h"
 
 #include <drm/intel-gtt.h>
-#include <drm/i915_drm.h>
 
 #include <linux/agp_backend.h>
 

drivers/gpu/drm/i915/pxp/intel_pxp_huc.c

@@ -3,8 +3,6 @@
  * Copyright(c) 2021-2022, Intel Corporation. All rights reserved.
  */
 
-#include <drm/i915_drm.h>
-
 #include "i915_drv.h"
 
 #include "gem/i915_gem_region.h"