userspace/libwr: remove unused functions from ptpd_netif

following functions were removed:
ptpd_netif_calibration_pattern_enable
ptpd_netif_calibration_pattern_disable
ptpd_netif_calibrating_disable
ptpd_netif_calibrating_enable
ptpd_netif_calibrating_poll
ptpd_netif_extsrc_detection
ptpd_netif_adjust_phase
ptpd_netif_adjust_in_progress
ptpd_netif_enable_timing_output
ptpd_netif_enable_phase_tracking
ptpd_netif_get_hw_addr
ptpd_netif_get_ifName
ptpd_netif_get_msec_tics
ptpd_netif_get_port_state
ptpd_netif_locking_disable
ptpd_netif_locking_enable
ptpd_netif_locking_poll
ptpd_netif_read_calibration_data
ptpd_netif_select

--function ptpd_netif_get_dmtd_phase was kept since it is commented as for debugging
--function ptpd_netif_close_socket even not used, should be preserved,
  because ptpd_netif_create_socket is available