Handle the case where the release value set is a list.

Bug: 304814040
Test: CI, unit test,
b build build/make/tools/aconfig:aconfig.test.cpp
b test build/make/tools/aconfig:AconfigJavaHostTest

Change-Id: Ie9063a6c0bd08f96e0593bad8cb731d826b25fea
diff --git a/core/soong_config.mk b/core/soong_config.mk
index e541c12..45e43f3 100644
--- a/core/soong_config.mk
+++ b/core/soong_config.mk
@@ -313,7 +313,7 @@
 $(call add_json_list, BuildVersionTags,    $(BUILD_VERSION_TAGS))
 
 $(call add_json_str, ReleaseVersion,    $(_RELEASE_VERSION))
-$(call add_json_str, ReleaseAconfigValueSets,    $(RELEASE_ACONFIG_VALUE_SETS))
+$(call add_json_list, ReleaseAconfigValueSets,    $(RELEASE_ACONFIG_VALUE_SETS))
 $(call add_json_str, ReleaseAconfigFlagDefaultPermission,    $(RELEASE_ACONFIG_FLAG_DEFAULT_PERMISSION))
 
 $(call add_json_bool, ReleaseDefaultModuleBuildFromSource,   $(RELEASE_DEFAULT_MODULE_BUILD_FROM_SOURCE))