aconfig_storage: create aconfig storage c++ flag value write api

Bug: b/312444587
Test: atest aconfig_storage_write_api.test.cpp
Change-Id: Ib08575b7e6ca23141ebbf739bf604a66da472dc2
diff --git a/tools/aconfig/TEST_MAPPING b/tools/aconfig/TEST_MAPPING
index 2f1694b..0ea8fea 100644
--- a/tools/aconfig/TEST_MAPPING
+++ b/tools/aconfig/TEST_MAPPING
@@ -82,6 +82,10 @@
       "name": "aconfig_storage_write_api.test.rust"
     },
     {
+      // aconfig_storage write api cpp integration tests
+      "name": "aconfig_storage_write_api.test.cpp"
+    },
+    {
       // aconfig_storage read api rust integration tests
       "name": "aconfig_storage_read_api.test.rust"
     },