ASoC: Intel: Skylake: Add dsp and ipc init helpers

This helper function will be used by the Skylake driver for dsp and
ipc initialization if processing pipe capability is supported.

Signed-off-by: Jeeja KP <jeeja.kp@intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>