drm/i915/display/frontbuffer: Prefer drm_WARN_ON over WARN_ON

struct drm_device specific drm_WARN* macros include device information
in the backtrace, so we know what device the warnings originate from.

Prefer drm_WARN_ON over WARN_ON.
Signed-off-by: Pankaj Bharadiya <pankaj.laxminarayan.bharadiya@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200406112800.23762-9-pankaj.laxminarayan.bharadiya@intel.com

drivers/gpu/drm/i915/display/intel_frontbuffer.c

@@ -302,12 +302,14 @@ void intel_frontbuffer_track(struct intel_frontbuffer *old,
 		     BITS_PER_TYPE(atomic_t));
 
 	if (old) {
-		WARN_ON(!(atomic_read(&old->bits) & frontbuffer_bits));
+		drm_WARN_ON(old->obj->base.dev,
+			    !(atomic_read(&old->bits) & frontbuffer_bits));
 		atomic_andnot(frontbuffer_bits, &old->bits);
 	}
 
 	if (new) {
-		WARN_ON(atomic_read(&new->bits) & frontbuffer_bits);
+		drm_WARN_ON(new->obj->base.dev,
+			    atomic_read(&new->bits) & frontbuffer_bits);
 		atomic_or(frontbuffer_bits, &new->bits);
 	}
 }