ASoC: SOF: Add support for loading topologies

SOF uses topology to define the DAPM graphs and widgets, DAIs, PCMs and set
parameters for init and run time usage. This patch loads topology and
maps it to IPC commands that are build the topology on the DSP.

Signed-off-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Signed-off-by: Liam Girdwood <liam.r.girdwood@linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Mark Brown <broonie@kernel.org>