util/superiotool: Add AST2400

Add support for AST2400 Super I/O.

The device doesn't have an ID register, so probe for scratch register
not to read as 0xff.

Tested on platform which has an AST2400.

Change-Id: I86af69c6b2ccefe2c88eef875bc858239df834f1
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/32984
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Kyösti Mälkki <kyosti.malkki@gmail.com>

util/superiotool/superiotool.h

@@ -190,6 +190,10 @@ void print_vendor_chips(const char *vendor,
 void probe_idregs_ali(uint16_t port);
 void print_ali_chips(void);
 
+/* aspeed.c */
+void probe_idregs_aspeed(uint16_t port);
+void print_aspeed_chips(void);
+
 /* amd.c */
 void probe_idregs_amd(uint16_t port);
 void print_amd_chips(void);
@@ -243,6 +247,7 @@ static const struct {
 	int ports[MAXNUMPORTS]; /* Signed, as we need EOT. */
 } superio_ports_table[] = {
 	{probe_idregs_ali,	{0x3f0, 0x370, EOT}},
+        {probe_idregs_aspeed,   {0x2e, 0x4e, EOT}},
 	{probe_idregs_exar,	{0x2e, 0x4e, EOT}},
 	{probe_idregs_fintek,	{0x2e, 0x4e, EOT}},
 	{probe_idregs_fintek_alternative,	{0x2e, 0x4e, EOT}},
@@ -278,6 +283,7 @@ static const struct {
 #ifdef PCI_SUPPORT
 	{print_via_chips},
 	{print_amd_chips},
+	{print_aspeed_chips},
 #endif
 	{print_serverengines_chips},
 	{print_infineon_chips},