drm/i915: include intel-gtt.h only where needed

Only intel_gt.c and intel_ggtt.c need the interface.

Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/034f57db24d6936ac2e4e6830261d791240cdd79.1636977089.git.jani.nikula@intel.com

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

@@ -9,6 +9,7 @@
 #include <asm/smp.h>
 
 #include <drm/i915_drm.h>
+#include <drm/intel-gtt.h>
 
 #include "gem/i915_gem_lmem.h"
 

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

@@ -3,6 +3,8 @@
  * Copyright © 2019 Intel Corporation
  */
 
+#include <drm/intel-gtt.h>
+
 #include "intel_gt_debugfs.h"
 
 #include "gem/i915_gem_lmem.h"

drivers/gpu/drm/i915/i915_drv.h

@@ -50,7 +50,6 @@
 #include <linux/stackdepot.h>
 #include <linux/xarray.h>
 
-#include <drm/intel-gtt.h>
 #include <drm/drm_gem.h>
 #include <drm/drm_auth.h>
 #include <drm/drm_cache.h>