opus reset decoder on seek completion to prevent stack overflow

apparently we should be doing this anyway

mark4o> The packets overlap and may reuse state set by other recent packets,
        so if you seek to a different position,
        resetting the state helps to ensure that the subsequent
        packets won't use the state set by the unrelated packets
        that were processed before the seek.

remove stack bump WORKAROUND_FS13060

Change-Id: I1c14e23b1721a360b91e3e55202c1557aef0fcc6
2 files changed