util/autoport: Remove bd82x6x/pch.h from generated mainboard.c

The southbridge/intel/bd82x6x/pch.h header was previously used to
configure a few registers in SPIBAR, but these have since been moved to
PCH code and the devicetree, making it unnecessary in mainboard.c

Change-Id: I904c95394b4fea73b4990342e647595b5f10335f
Signed-off-by: Nicholas Chin <nic.c3.14@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/82601
Reviewed-by: Felix Singer <service+coreboot-gerrit@felixsinger.de>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

util/autoport/bd82x6x.go

@@ -194,9 +194,6 @@ func (b bd82x6x) Scan(ctx Context, addr PCIDevData) {
 			Value: "\\_SB.PCI0.GFX0.DECB",
 		})
 
-	/* SPI init */
-	MainboardIncludes = append(MainboardIncludes, "southbridge/intel/bd82x6x/pch.h")
-
 	FADT := ctx.InfoSource.GetACPI()["FACP"]
 
 	pcieHotplugMap := "{ "