net/ice/base: add clock initialization function

net/ice/base: add clock initialization function

Before the device PTP hardware clock can be initialized, some steps must
be taken by the driver. This includes writing some registers and
initializing the PHY.

Some of these steps are distinct depending on the device type (E810 or
E822). Additionally, a future change will introduce more steps for E822
devices to program the Clock Generation Unit.

Introduce ice_ptp_init_phc as well as device-specific sub-functions for
e810 and e822 devices.

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>