msm: fsm_bbif: Change DAC default value

Updated the driver for updated DAC default value and added flexibility to
change the values from application.

Change-Id: I0668c90ee239b9e5343d4968970086b3118cd33e
Acked-by: Edward Rodrigues <erodrigu@qti.qualcomm.com>
Signed-off-by: Rohit Vaswani <rvaswani@codeaurora.org>