drm/i915: Include <drm/drm_auth.h>

One of the source files includes <drm/drm_auth.h> via <drm/drm_legacy.h>,
which will be removed. Include drm_auth.h directly.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: intel-gfx@lists.freedesktop.org
Reviewed-by: David Airlie <airlied@gmail.com>
Reviewed-by: Daniel Vetter <daniel@ffwll.ch>
Acked-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231122122449.11588-5-tzimmermann@suse.de

drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c

@@ -9,6 +9,7 @@
 #include <linux/sync_file.h>
 #include <linux/uaccess.h>
 
+#include <drm/drm_auth.h>
 #include <drm/drm_syncobj.h>
 
 #include "display/intel_frontbuffer.h"