util/kconfig: Add toada Ada spec generation tool

Converts `auto.conf` to an Ada spec file. Write to
$(obj)/cb-config.ads and set the package name to
`CB.Config`.

Change-Id: I97c060d8a613c74a82a18aff9524ad4b01f9df56
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/31053
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>

Makefile

@@ -44,6 +44,7 @@ COREBOOT_EXPORTS += top src srck obj objutil objk
 
 DOTCONFIG ?= $(top)/.config
 KCONFIG_CONFIG = $(DOTCONFIG)
+KCONFIG_AUTOADS := $(obj)/cb-config.ads
 KCONFIG_AUTOHEADER := $(obj)/config.h
 KCONFIG_AUTOCONFIG := $(obj)/auto.conf
 KCONFIG_DEPENDENCIES := $(obj)/auto.conf.cmd
@@ -51,10 +52,12 @@ KCONFIG_SPLITCONFIG := $(obj)/config
 KCONFIG_TRISTATE := $(obj)/tristate.conf
 KCONFIG_NEGATIVES := 1
 KCONFIG_STRICT := 1
+KCONFIG_PACKAGE := CB.Config
 
 COREBOOT_EXPORTS += KCONFIG_CONFIG KCONFIG_AUTOHEADER KCONFIG_AUTOCONFIG
 COREBOOT_EXPORTS += KCONFIG_DEPENDENCIES KCONFIG_SPLITCONFIG KCONFIG_TRISTATE
 COREBOOT_EXPORTS += KCONFIG_NEGATIVES KCONFIG_STRICT
+COREBOOT_EXPORTS += KCONFIG_AUTOADS KCONFIG_PACKAGE
 
 # directory containing the toplevel Makefile.inc
 TOPLEVEL := .
@@ -179,6 +182,12 @@ real-all: real-target
 $(KCONFIG_AUTOHEADER): $(KCONFIG_CONFIG) $(objutil)/kconfig/conf
 	+$(MAKE) oldconfig
 
+$(KCONFIG_AUTOCONFIG): $(KCONFIG_AUTOHEADER)
+	true
+
+$(KCONFIG_AUTOADS): $(KCONFIG_AUTOCONFIG) $(objutil)/kconfig/toada
+	$(objutil)/kconfig/toada CB.Config <$< >$@
+
 # Add a new class of source/object files to the build system
 add-class= \
 	$(eval $(1)-srcs:=) \