[PULL 08/14] tests/tcg: remove ADDITIONAL_PLUGINS_TESTS

["Alex Bennée" <alex.bennee@linaro.org>]

We never actually used this is the end. Remove it to enable
re-factoring.

Fixes: 7cefff22d54 (tests/tcg: add mechanism to run specific tests with plugins)
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-ID: <20250725154517.3523095-9-alex.bennee@linaro.org>

diff --git a/tests/tcg/Makefile.target b/tests/tcg/Makefile.target
index 3d96182a7b9..97ebe8f9bc9 100644
--- a/tests/tcg/Makefile.target
+++ b/tests/tcg/Makefile.target
@@ -169,11 +169,10 @@ PLUGINS=$(filter-out $(DISABLE_PLUGINS), \
 # only expand MULTIARCH_TESTS which are common on most of our targets
 # to avoid an exponential explosion as new tests are added. We also
 # add some special helpers the run-plugin- rules can use below.
-# In more, extra tests can be added using ADDITIONAL_PLUGINS_TESTS variable.
 
 ifneq ($(MULTIARCH_TESTS),)
 $(foreach p,$(PLUGINS), \
-	$(foreach t,$(MULTIARCH_TESTS) $(ADDITIONAL_PLUGINS_TESTS),\
+	$(foreach t,$(MULTIARCH_TESTS),\
 		$(eval run-plugin-$(t)-with-$(p): $t $p) \
 		$(eval RUN_TESTS+=run-plugin-$(t)-with-$(p))))
 endif # MULTIARCH_TESTS
-- 
2.47.2