ASoC: Intel: Show Baytrail SST DSP firmware details during init

DSP initialization complete message IPC_IA_FW_INIT_CMPLT is a large message
carrying firmware details in mailbox. Read and show those details during
init in order to be able to get that information to QA reports.

Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Mark Brown <broonie@linaro.org>