ice: refactor ice_ptp_hw to make functions static

As following methods are not used outside ice_ptp_hw,
they can be made static:
ice_read_phy_reg_e822
ice_write_phy_reg_e822
ice_ptp_prep_port_adj_e822

Signed-off-by: Jan Sokolowski <jan.sokolowski@intel.com>
Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>
Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@intel.com>
Reviewed-by: Leon Romanovsky <leonro@nvidia.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

drivers/net/ethernet/intel/ice/ice_ptp_hw.c

@@ -293,7 +293,7 @@ static bool ice_is_40b_phy_reg_e822(u16 low_addr, u16 *high_addr)
  *
  * Read a PHY register for the given port over the device sideband queue.
  */
-int
+static int
 ice_read_phy_reg_e822(struct ice_hw *hw, u8 port, u16 offset, u32 *val)
 {
 	struct ice_sbq_msg_input msg = {0};
@@ -370,7 +370,7 @@ ice_read_64b_phy_reg_e822(struct ice_hw *hw, u8 port, u16 low_addr, u64 *val)
  *
  * Write a PHY register for the given port over the device sideband queue.
  */
-int
+static int
 ice_write_phy_reg_e822(struct ice_hw *hw, u8 port, u16 offset, u32 val)
 {
 	struct ice_sbq_msg_input msg = {0};
@@ -1079,7 +1079,7 @@ ice_ptp_prep_phy_time_e822(struct ice_hw *hw, u32 time)
  *
  * Negative adjustments are supported using 2s complement arithmetic.
  */
-int
+static int
 ice_ptp_prep_port_adj_e822(struct ice_hw *hw, u8 port, s64 time)
 {
 	u32 l_time, u_time;

drivers/net/ethernet/intel/ice/ice_ptp_hw.h

@@ -141,11 +141,8 @@ int ice_ptp_init_phc(struct ice_hw *hw);
 int ice_get_phy_tx_tstamp_ready(struct ice_hw *hw, u8 block, u64 *tstamp_ready);
 
 /* E822 family functions */
-int ice_read_phy_reg_e822(struct ice_hw *hw, u8 port, u16 offset, u32 *val);
-int ice_write_phy_reg_e822(struct ice_hw *hw, u8 port, u16 offset, u32 val);
 int ice_read_quad_reg_e822(struct ice_hw *hw, u8 quad, u16 offset, u32 *val);
 int ice_write_quad_reg_e822(struct ice_hw *hw, u8 quad, u16 offset, u32 val);
-int ice_ptp_prep_port_adj_e822(struct ice_hw *hw, u8 port, s64 time);
 void ice_ptp_reset_ts_memory_quad_e822(struct ice_hw *hw, u8 quad);
 
 /**