ice: check low latency PHY timer update firmware capability

Newer versions of firmware support programming the PHY timer via the low
latency interface exposed over REG_LL_PROXY_L and REG_LL_PROXY_H. Add
support for checking the device capabilities for this feature.

Co-developed-by: Karol Kolacinski <karol.kolacinski@intel.com>
Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>
Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Milena Olech <milena.olech@intel.com>
Signed-off-by: Anton Nadezhdin <anton.nadezhdin@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>