drm/i915/i915_drv: 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.

changes since v1:
- Add parentheses around the dev_priv macro argument (Jani)

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/20200504181600.18503-7-pankaj.laxminarayan.bharadiya@intel.com

drivers/gpu/drm/i915/i915_drv.h

@@ -1662,7 +1662,8 @@ IS_SUBPLATFORM(const struct drm_i915_private *i915,
 #define HAS_DISPLAY(dev_priv) (INTEL_INFO(dev_priv)->pipe_mask != 0)
 
 /* Only valid when HAS_DISPLAY() is true */
-#define INTEL_DISPLAY_ENABLED(dev_priv) (WARN_ON(!HAS_DISPLAY(dev_priv)), !i915_modparams.disable_display)
+#define INTEL_DISPLAY_ENABLED(dev_priv) \
+		(drm_WARN_ON(&(dev_priv)->drm, !HAS_DISPLAY(dev_priv)), !i915_modparams.disable_display)
 
 static inline bool intel_vtd_active(void)
 {