mainboard/google/coral: Override VBT selection for astronaut

Current VBT setting for T8 is only 1ms which is under Innolux
N116BCA-EA1 panel's spec.

Modify T8 to 100ms.
(Innolux's panel's spec requires T8 needs to be greater than 80ms)

CQ-DEPEND=CL:*496012
BUG=b:67756548
BRANCH=master
TEST=emerge-coral depthcharge coreboot chromeos-bootimage
     Run on DUT and check panel sequence meets spec.

Change-Id: I580567decfccd78366c37181255015ac2cd76493
Signed-off-by: Ren Kuo <Ren.Kuo@quantatw.com>
Reviewed-on: https://review.coreboot.org/22306
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Ren Kuo <ren.kuo@quantatw.com>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

src/mainboard/google/reef/variants/coral/mainboard.c

@@ -89,6 +89,10 @@ const char *mainboard_vbt_filename(void)
 	int sku_id = variant_board_sku();
 
 	switch (sku_id) {
+        case SKU_0_ASTRONAUT:
+        case SKU_1_ASTRONAUT:
+		return "vbt-astronaut.bin";
+		break;
 	case SKU_2_SANTA:
 	case SKU_3_SANTA:
 		return "vbt-santa.bin";