soundwire: add a blank line between functions

For improving code readability it helps to have a blank line between
function so add when missing.

Checkpatch complains:
CHECK: Please use a blank line after function/struct/union/enum
declarations
Signed-off-by: NVinod Koul <vkoul@kernel.org>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/soundwire/stream.c

@@ -52,6 +52,7 @@ static int sdw_find_row_index(int row)
 	pr_warn("Requested row not found, selecting lowest row no: 48\n");
 	return 0;
 }
+
 static int _sdw_program_slave_port_params(struct sdw_bus *bus,
 					  struct sdw_slave *slave,
 					  struct sdw_transport_params *t_params,