msm: sps: Correct descriptor fifo address to dump contents

Few clients of BAM will use SMMU for data transfers.
Assign correct descriptor fifo address for SMMU clients
of BAM while dumping contents.

Change-Id: I21584e6778315f51cac0d202d41f4c81a56fcbf0
Signed-off-by: Rama Krishna Phani A <rphani@codeaurora.org>