drm/modes: Add DRM_SIMPLE_MODE()

This adds a helper macro to specify modes that only contain info about
resolution.

v2: Actually set the width and height (Ilia Mirkin)

Cc: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20190210131039.52664-5-noralf@tronnes.org

drivers/gpu/drm/tinydrm/mi0283qt.c

@@ -145,7 +145,7 @@ static const struct drm_simple_display_pipe_funcs mi0283qt_pipe_funcs = {
 };
 
 static const struct drm_display_mode mi0283qt_mode = {
-	TINYDRM_MODE(320, 240, 58, 43),
+	DRM_SIMPLE_MODE(320, 240, 58, 43),
 };
 
 DEFINE_DRM_GEM_CMA_FOPS(mi0283qt_fops);