soundwire: intel: Add stream initialization

Add Intel stream init routines which initialize the Physical
Data Interface (PDI), Audio Link Hub (ALH) and Audio shim.
Also add bank switch routines.

Signed-off-by: Hardik T Shah <hardik.t.shah@intel.com>
Signed-off-by: Sanyog Kale <sanyog.r.kale@intel.com>
Signed-off-by: Shreyas NC <shreyas.nc@intel.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>