Settings(DSDS): Add TuneAway and PrioritySub to MultiSimSettings

1. Add support for TuneAway and PrioritySub UI options in
MultiSimSettings
2. Add setDefaultVoiceSub, setTuneAway and setPrioritySub
OEM HOOK requests in OSS space
CRs-fixed: 464483

Change-Id: I3b1bc4ed98b3ed7b280938878ba9d7bdb244fcf9