If an AudioRecord is created with the "fixedVolume" tag
when recording from REMOTE_SUBMIX, treat the
device DEVICE_OUT_REMOTE_SUBMIX as a fixed full volume
device during the recording. Also register a death
handler during the recording.
Otherwise this is a no-op.
Bug 17635294
Change-Id: I8d26fe777047126f34308e1e1b7ac28ba269ad89