soundwire: bus: demote clock stop prepare log to dev_dbg()

There is no real reason to provide this information except for debug
sessions, hence dev_dbg() is a better fit.
Reported-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20210302091122.13952-5-yung-chuan.liao@linux.intel.comSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/soundwire/bus.c

@@ -906,7 +906,7 @@ static int sdw_bus_wait_for_clk_prep_deprep(struct sdw_bus *bus, u16 dev_num)
 		}
 		val &= SDW_SCP_STAT_CLK_STP_NF;
 		if (!val) {
-			dev_info(bus->dev, "clock stop prep/de-prep done slave:%d",
+			dev_dbg(bus->dev, "clock stop prep/de-prep done slave:%d",
 				dev_num);
 			return 0;
 		}