Hook up Kconfig Ada spec file

We generate a $(obj)/cb-config.ads once and copy it per stage that uses
it to $(obj)/<stage>/cb-config.ads (to simplify the gnat-bind step). The
Ada package is called `CB.Config`. As there was no `CB` package yet, add
that too.

Change-Id: I963a6517ef4bcf84f2c8e9ae8d24a0d6b971d2b0
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/c/30584
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>

src/lib/Makefile.inc

@@ -296,6 +296,8 @@ $(objcbfs)/%.debug.rmod: $(objcbfs)/%.debug | $(RMODTOOL)
 $(obj)/%.elf.rmod: $(obj)/%.elf | $(RMODTOOL)
 	$(RMODTOOL) -i $< -o $@
 
+ramstage-$(CONFIG_RAMSTAGE_ADA) += cb.ads
+
 ifeq ($(CONFIG_RAMSTAGE_LIBHWBASE),y)
 
 to-ada-hex = $(eval $(1) := 16\\\#$(patsubst 0x%,%,$($(1)))\\\#)

src/lib/cb.ads

@@ -0,0 +1,2 @@
+package CB is
+end CB;