util/testing: Add cbfstool tools to tested utils

Previously, cbfstool was tested as part of the coreboot build, but not
tested individually. This let a change that broke elogtool slip through.

Signed-off-by: Martin Roth <martin@coreboot.org>
Change-Id: I9e7b7a01d4a77ffdac932ba5af12cbd1ba96628b
Reviewed-on: https://review.coreboot.org/c/coreboot/+/62406
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Singer <felixsinger@posteo.net>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>

util/testing/Makefile.inc

@@ -51,6 +51,7 @@ junit.xml:
 
 TOOLLIST= \
 amdfwtool \
+cbfstool \
 cbmem \
 ectool \
 futility \