remove android.app.Flags in SubRemoteService

This change remove flag in SubRemoteService.

Here are several issues of using the flag in the helper app.

1. First the helper direcly use the flag from framework jar.
   This helper app is used by CTS tests, which should only test the
   behavior of API or CDD. But this flag is not part of API or CDD so
   it is not guaranteed on every devices.
2. Second this helper app has `platform_apis: true` which is not
   expected settings for cts tests or the helper, since `platform_api:
   true` means this helper app can use the hidden APIs in framework
   which is not guaranteed on every devices.

Test: ABTD trigger the test
Bug: 411715086
Flag: EXEMPT remove flag usage
Change-Id: Iccc3c1fe6fbb3865b77d73afe53b5738edc968a8
1 file changed