Revert "soc/mediatek/common: Remove 200 ms delay from eDP init path"

This reverts commit df7bf9404d.

Reason for revert: This breaks Skywalker firmware display.

Change-Id: I92cb26533c73f4e0c552f3c41d9c1f408ca2d083
Signed-off-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/88812
Reviewed-by: Yidi Lin <yidilin@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/soc/mediatek/common/display.c

@@ -90,6 +90,7 @@ int mtk_display_init(void)
 	process_panel_quirks(&mtk_edp, panel);
 
 	if (panel->disp_path == DISP_PATH_EDP) {
+		mdelay(200);
 		if (mtk_edp_init(&mtk_edp, &edid) < 0) {
 			printk(BIOS_ERR, "%s: Failed to initialize eDP\n", __func__);
 			return -1;