Add new goal for compat file generator

To generate compat files, we need the following files.

- base_plat_sepolicy: to get all types
- base_plat_pub_policy.cil: to get public types
- {ver}_plat_sepolicy: to get old types

This creates a new dist goal, base-sepolicy-files-for-mapping, to
conveniently generate and gather desired files under out/dist.

Bug: 214336258
Test: build/soong/soong_ui.bash --make-mode dist \
      base-sepolicy-files-for-mapping \
      TARGET_PRODUCT=aosp_arm64 TARGET_BUILD_VARIANT=userdebug
Change-Id: I2f210ab47be777cd91346d635f75064845821144

Android.bp

@@ -865,6 +865,9 @@ precompiled_se_policy_binary {
         "sepolicy_neverallows",
         "sepolicy_neverallows_vendor",
     ],
+    dist: {
+        targets: ["base-sepolicy-files-for-mapping"],
+    },
 }
 
 // policy for recovery
@@ -933,6 +936,9 @@ se_policy_binary {
     name: "base_plat_sepolicy",
     srcs: [":base_plat_sepolicy.cil"],
     installable: false,
+    dist: {
+        targets: ["base-sepolicy-files-for-mapping"],
+    },
 }
 
 se_policy_conf {
@@ -1003,6 +1009,9 @@ se_policy_cil {
     filter_out: [":reqd_policy_mask.cil"],
     secilc_check: false,
     installable: false,
+    dist: {
+        targets: ["base-sepolicy-files-for-mapping"],
+    },
 }
 
 se_policy_conf {

treble_sepolicy_tests_for_release.mk

@@ -85,6 +85,9 @@ $(built_$(version)_plat_sepolicy): $($(version)_plat_policy.conf) $(HOST_OUT_EXE
 	$(hide) cat $(PRIVATE_ADDITIONAL_CIL_FILES) >> $@
 	$(hide) $(HOST_OUT_EXECUTABLES)/secilc -m -M true -G -c $(POLICYVERS) $(PRIVATE_NEVERALLOW_ARG) $@ -o $@ -f /dev/null
 
+# TODO(b/214336258): move to Soong
+$(call dist-for-goals,base-sepolicy-files-for-mapping,$(built_$(version)_plat_sepolicy):$(version)_plat_sepolicy)
+
 $(version)_plat_policy.conf :=
 
 # $(version)_compat - the current plat_sepolicy.cil built with the compatibility file