util/testing: remove genprof target

commit 8c99c27df1 removed util/genprof,
so it needs to be dropped here as well to avoid spurious breakages of
the build.

Change-Id: I420b5c43e2d97373a8e665f457463a06e16ecfb9
Signed-off-by: Felix Held <felix-coreboot@felixheld.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49226
Reviewed-by: Raul Rangel <rrangel@chromium.org>
Reviewed-by:  Felix Singer <felixsinger@posteo.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

util/testing/Makefile.inc

@@ -55,7 +55,6 @@ amdfwtool \
 cbmem \
 ectool \
 futility \
-genprof \
 intelmetool \
 inteltool \
 intelvbttool \