ASoC: msm8974: Set tx bit rate for slim tx params

Set tx bit rate format in slimbus tx hw fixup params.

CRs-Fixed: 659408
Change-Id: I02b7cb88ca180cac033e9f5b63af287b2d932c10
Signed-off-by: Sudheer Papothi <spapothi@codeaurora.org>