tests/Makefile.include: Let "make clean" remove the TCG tests, too

"make clean" should clear all binaries that have been built, but so
far it left the TCG tests still in place. Let's make sure that they
are now removed, too.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220301085900.1443232-1-thuth@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

tests/Makefile.include

@@ -155,6 +155,6 @@ check-build: run-ninja
 check-clean:
 	rm -rf $(TESTS_VENV_DIR) $(TESTS_RESULTS_DIR)
 
-clean: check-clean
+clean: check-clean clean-tcg
 
 endif