Convert oemaids_headers / passwd / group to Soong

Bug: 118089258
Test: m oemaids_header_gen oemaids_headers passwd group
Change-Id: Ie3b92a499b44391e0692da5d9ad067089a62aabb
diff --git a/core/soong_config.mk b/core/soong_config.mk
index 0275de6..c01fc98 100644
--- a/core/soong_config.mk
+++ b/core/soong_config.mk
@@ -165,6 +165,8 @@
 $(call add_json_list, ProductHiddenAPIStubsSystem,       $(PRODUCT_HIDDENAPI_STUBS_SYSTEM))
 $(call add_json_list, ProductHiddenAPIStubsTest,         $(PRODUCT_HIDDENAPI_STUBS_TEST))
 
+$(call add_json_str,  TargetFSConfigGen,                 $(TARGET_FS_CONFIG_GEN))
+
 $(call add_json_map, VendorVars)
 $(foreach namespace,$(SOONG_CONFIG_NAMESPACES),\
   $(call add_json_map, $(namespace))\