Add soong system image configs

USE_SOONG_DEFINED_SYSTEM_IMAGE is true when the target is using a
system image defined in soong.
PRODUCT_SOONG_DEFINED_SYSTEM_IMAGE is the module name of the soong
defined system image.

Bug: 350599535
Test: lunch aosp_cf_x86_64_phone_soong_system-trunk_staging-userdebug
      && m
Change-Id: Ic5c848fb649a5a61de1a5a253438b2d77d200a6b
diff --git a/core/soong_config.mk b/core/soong_config.mk
index fddb500..1e6388a 100644
--- a/core/soong_config.mk
+++ b/core/soong_config.mk
@@ -236,6 +236,12 @@
 
 $(call add_json_list, TargetFSConfigGen,                 $(TARGET_FS_CONFIG_GEN))
 
+# Although USE_SOONG_DEFINED_SYSTEM_IMAGE determines whether to use the system image specified by
+# PRODUCT_SOONG_DEFINED_SYSTEM_IMAGE, PRODUCT_SOONG_DEFINED_SYSTEM_IMAGE is still used to compare
+# installed files between make and soong, regardless of the USE_SOONG_DEFINED_SYSTEM_IMAGE setting.
+$(call add_json_bool, UseSoongSystemImage,               $(filter true,$(USE_SOONG_DEFINED_SYSTEM_IMAGE)))
+$(call add_json_str,  ProductSoongDefinedSystemImage,    $(PRODUCT_SOONG_DEFINED_SYSTEM_IMAGE))
+
 $(call add_json_map, VendorVars)
 $(foreach namespace,$(sort $(SOONG_CONFIG_NAMESPACES)),\
   $(call add_json_map, $(namespace))\