soong_config: Add new flag for vendor_init

Change-Id: I383f1de230ecf7b79d78fe701b140bd1bc6795f2
diff --git a/build/soong/soong_config.mk b/build/soong/soong_config.mk
index b682af9..b5b753e 100644
--- a/build/soong/soong_config.mk
+++ b/build/soong/soong_config.mk
@@ -13,6 +13,7 @@
 $(call add_json_bool, Supports_hw_fde, $(filter true,$(TARGET_HW_DISK_ENCRYPTION)))
 $(call add_json_bool, Supports_hw_fde_perf, $(filter true,$(TARGET_HW_DISK_ENCRYPTION_PERF)))
 $(call add_json_bool, Supports_legacy_hw_fde, $(filter true,$(TARGET_LEGACY_HW_DISK_ENCRYPTION)))
+$(call add_json_str_omitempty, Target_init_vendor_lib, $(TARGET_INIT_VENDOR_LIB))
 $(call add_json_str_omitempty, Target_process_sdk_version_override, $(TARGET_PROCESS_SDK_VERSION_OVERRIDE))
 $(call add_json_str_omitempty, Target_shim_libs, $(subst $(space),:,$(TARGET_LD_SHIM_LIBS)))
 $(call add_json_bool, Uses_generic_camera_parameter_library, $(if $(TARGET_SPECIFIC_CAMERA_PARAMETER_LIBRARY),,true))