[Media ML] Remove DumpUtils#checkDumpPermission

Copy over hidden API DumpUtils#checkDumpPermission implementation to
MediaSessionService.

Bug: 172890107
Test: Run "dumpsys media_session" on an application wihout DUMP
permission and check if call fails with Permission Denial log.

Change-Id: I8c17d6663233064798f434e156939857a9e5e733
2 files changed