SoC: soundwire: Update debug soundwire master read/write functions

Replace debug read/write register functions with
swr_master_read/swr_master_write to support different interfaces to
access soundwire registers.

Change-Id: I377bb927ee769a18c0179045953a521d0a83057f
Signed-off-by: Sudheer Papothi <spapothi@codeaurora.org>