verstage: provide support for serial console

verstage previously lacked serial console support.
Add the necessary objects and macro checks to allow
verstage to include the serial console.

Change-Id: Ibe911ad347cac0b089f5bc0d4263956f44f3d116
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/10196
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins)

src/console/Makefile.inc

@@ -6,6 +6,8 @@ ramstage-y += die.c
 smm-$(CONFIG_DEBUG_SMI) += init.c console.c vtxprintf.c printk.c
 smm-$(CONFIG_SMM_TSEG) += die.c
 
+verstage-y += init.c
+verstage-y += printk.c
 verstage-y += vtxprintf.c
 verstage-y += console.c
 verstage-y += die.c