mb/google/dedede/var/bugzzy: Configure DDI port A as MIPI DSI

Override DdiPortAConfig as MIPI DSI

BUG=b:192521391
BRANCH=None
TEST=Built test coreboot image and boot on bugzzy board

Change-Id: If308f9d69fea56176527e7b67f36b29c43adb525
Signed-off-by: Seunghwan Kim <sh_.kim@samsung.corp-partner.google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/57107
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Henry Sun <henrysun@google.com>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

src/mainboard/google/dedede/variants/bugzzy/overridetree.cb

@@ -1,4 +1,6 @@
 chip soc/intel/jasperlake
+	# MIPI display panel
+	register "DdiPortAConfig" = "2" # DdiPortMipiDsi
 
 	# USB Port Configuration
 	register "usb2_ports[0]" = "{