device: Add back dummy HT_CHAIN_UNITID_BASE

This should be defined by mainboard. Add a dummy
default to fix master while HyperTransport files
are still around referencing this.

Change-Id: I58188a200a2cad5fa20affee1844117ba71ac338
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/37036
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/device/Kconfig

@@ -499,6 +499,14 @@ config HYPERTRANSPORT_PLUGIN_SUPPORT
 	bool
 	default n
 
+config HT_CHAIN_UNITID_BASE
+	int
+	default 0
+
+config HT_CHAIN_END_UNITID_BASE
+	int
+	default 0
+
 config PCIX_PLUGIN_SUPPORT
 	bool
 	default y