ice: move TSPLL functions to a separate file

ice: move TSPLL functions to a separate file

Collect TSPLL related functions and definitions and move them to
a separate file to have all TSPLL functionality in one place.

Move CGU related functions and definitions to ice_common.*

Reviewed-by: Michal Kubiak <michal.kubiak@intel.com>
Reviewed-by: Milena Olech <milena.olech@intel.com>
Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>
Tested-by: Rinitha S <sx.rinitha@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>