drm/i915/display/icl_dsi: 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/20200406112800.23762-2-pankaj.laxminarayan.bharadiya@intel.com

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

@@ -1195,7 +1195,7 @@ static void gen11_dsi_enable(struct intel_atomic_state *state,
 {
 	struct intel_dsi *intel_dsi = enc_to_intel_dsi(encoder);
 
-	WARN_ON(crtc_state->has_pch_encoder);
+	drm_WARN_ON(state->base.dev, crtc_state->has_pch_encoder);
 
 	/* step6d: enable dsi transcoder */
 	gen11_dsi_enable_transcoder(encoder);