drm/i915/debugfs: use struct drm_device based logging

Convert all the DRM_* logging macros to the struct drm_device based
macros to provide device specific logging.

No functional changes.

Cc: Wambui Karuga <wambui.karugax@gmail.com>
Reviewed-by: Wambui Karuga <wambui.karugax@gmail.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200402114819.17232-6-jani.nikula@intel.com

drivers/gpu/drm/i915/i915_debugfs.c

@@ -741,7 +741,7 @@ i915_error_state_write(struct file *filp,
 	if (!error)
 		return 0;
 
-	DRM_DEBUG_DRIVER("Resetting error state\n");
+	drm_dbg(&error->i915->drm, "Resetting error state\n");
 	i915_reset_error_state(error->i915);
 
 	return cnt;