Allow modernize-use-emplace warnings

Bug: 247585041
Test: presubmit
Test: lunch aosp_cf_arm64_only_phone_hwasan-userdebug;
Test: make tidy-frameworks-base-cmds-idmap2_subset
Change-Id: I2cd78fddb330c3fda3bbb88c2470dfb8b51ea4cf

cmds/idmap2/Android.bp

@@ -41,6 +41,7 @@ cc_defaults {
         "-modernize-return-braced-init-list",
         "-modernize-use-default-member-init",
         "-modernize-use-equals-default",
+        "-modernize-use-emplace",
         "-modernize-use-nodiscard",
         "-modernize-use-override",
         "-modernize-use-trailing-return-type",