In case of failure in loading customize topology firmware, dfw_sst.bin
gets loaded. However, current log provides this message as error even
after successfully falling back to default topology "dfw_sst.bin".

Hence to convey proper message, changing log level and message.
Signed-off-by: Chintan Patel <chintan.m.patel@intel.com>
Acked-By: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>