A multi link bankswitch can be done if the hardware supports and
the stream is handled by multiple Master(s).
This preparatory patch adds support to track m_rt in a stream.
Modifying m_rt_count and usage is added as part of the next patch.
Signed-off-by: Shreyas NC <firstname.lastname@example.org>
Acked-by: Pierre-Louis Bossart <email@example.com>
Signed-off-by: Vinod Koul <firstname.lastname@example.org>