Disable modernize-use-trailing-return-type clang-tidy check

Upcoming clang update introduced the new modernize-use-trailing-return-type
check which is not useful. Disable this warning for now (even before the
new clang update lands) since clang-tidy doesn't complain about flags it
doesn't know.

Test: build with new clang-tidy
Bug: 131328001
Change-Id: I7fbc10fb9044904f85f9a1ec6cf712ce3cec0a79
Exempt-From-Owner-Approval: Trivial, no functionality change

cmds/idmap2/Android.bp

@@ -18,6 +18,7 @@ cc_defaults {
     tidy_checks: [
         "modernize-*",
         "-modernize-avoid-c-arrays",
+        "-modernize-use-trailing-return-type",
         "android-*",
         "misc-*",
         "readability-*",