net/ice/base: add functions for device clock control

net/ice/base: add functions for device clock control

The ice hardware supports exposing a hardware clock for high precision
timestamping. This is primarily intended for accelerating the Precision
Time Protocol.

Add several low level functions intended to be used as the basis for
enabling the device clock, and ensuring that the port timers are
synchronized properly.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
Acked-by: Junfeng Guo <junfeng.guo@intel.com>