Change MODIFY_AUDIO_ROUTING permission to MEDIA_CONTENT_CONTROL

As changing the permission for MediaRouter2 system APIs, this CL
changes the permission in shell accordingly.

The permission was added by ag/13959439.

Bug: 183428114
Test: Passed CTS tests
Change-Id: I3aee256a11db730dd786e69821f3bb8bd590074f
2 files changed