mb/*/mainboard.c: Get rid of SPI AFC register

The AFC—Additional Flash Control Register is set by
southbridge code.

Remove redundant calls and get rid of it in autoport.

Change-Id: I627082e09dd055e3b3c4dd8e0b90965a9fcb4342
Signed-off-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-on: https://review.coreboot.org/19493
Tested-by: build bot (Jenkins)
Reviewed-by: Nico Huber <nico.h@gmx.de>

util/autoport/bd82x6x.go

@@ -180,7 +180,7 @@ func (b bd82x6x) Scan(ctx Context, addr PCIDevData) {
 	/* SPI init */
 	MainboardIncludes = append(MainboardIncludes, "southbridge/intel/bd82x6x/pch.h")
 	/* FIXME:XX Move this to runtime.  */
-	for _, addr := range []uint16{0x38c8, 0x38c4, 0x38c0} {
+	for _, addr := range []uint16{0x38c8, 0x38c4} {
 		MainboardInit += fmt.Sprintf("\tRCBA32(0x%04x) = 0x%08x;\n", addr, inteltool.RCBA[addr])
 	}