ice: rename ice_ptp_init_phc_eth56g function

ice: rename ice_ptp_init_phc_eth56g function

Refactor the code by changing ice_ptp_init_phc_eth56g function
name to ice_ptp_init_phc_e825, to be consistent with the naming pattern
for other devices.

Signed-off-by: Karol Kolacinski <karol.kolacinski@intel.com>
Signed-off-by: Grzegorz Nitka <grzegorz.nitka@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Tested-by: Rinitha S <sx.rinitha@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Link: https://patch.msgid.link/20250310174502.3708121-3-anthony.l.nguyen@intel.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>