ice: extract ice_init_dev() from ice_init()

ice: extract ice_init_dev() from ice_init()

Extract ice_init_dev() from ice_init(), to allow service task and IRQ
scheme teardown to be put after clearing SW constructs in the subsequent
commit.

Signed-off-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@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>