msm: sps: add handling of late EOT.

The EOT signal can come later after the descriptor has been closed
by BAM HW. Add the support to handle this late EOT at the pipe
level

Change-Id: Ibd2e467cf77e792888bb3748e8b31924911e2651
Signed-off-by: Yan He <yanhe@codeaurora.org>
Signed-off-by: Satish Kamuju <skamuj@codeaurora.org>