it87spi.c: Enable probing of IT8686E

Enable probing for IT8686E allowing to use the `dualbiosindex`
parameter. Dumped and verified both firmwares. Tested on GIGABYTE
GA-H270N-WIFI.

Signed-off-by: Pete Smith <zailawee@protonmail.com>
Change-Id: I5a1780275a92089c2d91c5da1c472f6d8bc39a56
Original-Reviewed-on: https://review.coreboot.org/c/flashrom/+/64254
Original-Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Original-Reviewed-by: Thomas Heijligen <src@posteo.de>
Original-Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Original-Reviewed-by: Felix Singer <felixsinger@posteo.net>
Reviewed-on: https://review.coreboot.org/c/flashrom-stable/+/71468
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/it87spi.c b/it87spi.c
index 686a444..5713bde 100644
--- a/it87spi.c
+++ b/it87spi.c
@@ -241,6 +241,7 @@
 		case 0x8705:
 			ret |= it8705f_write_enable(superios[i].port);
 			break;
+		case 0x8686:
 		case 0x8716:
 		case 0x8718:
 		case 0x8720: