util/mtkheader: Add GFH header for mt8189 bootblock code

Set bootblock load address for bootROM.

BUG=b:379008996
BRANCH=none
TEST=Build Pass.

Change-Id: I47078272880a89e81c851ede307cdc306b1c79ac
Signed-off-by: Vince Liu <vince-wl.liu@mediatek.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/85598
Reviewed-by: Paul Menzel <paulepanter@mailbox.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Reviewed-by: Yidi Lin <yidilin@google.com>

util/mtkheader/gen-bl-img.py

@@ -24,6 +24,7 @@ def gen_gfh_info(chip, data):
 	entries = {
 		'mt8173': 0x000C1000,
 		'mt8183': 0x00201000,
+		'mt8189': 0x02001000,
 		'mt8196': 0x02001000,
 	}