soc: soundwire: Update ssp period for fractional sample rates

Frame sync for fractional sample rates is different. Update
ssp period based on frame sync of fractional sample rate
for synchronization of the data channels.

Change-Id: I25eaa5195abcdfad54cfed09beb0abe5aff2499a
Signed-off-by: Sudheer Papothi <spapothi@codeaurora.org>