rewrote pps_gen driver (to match the libswitchhw one), removed remaining references to UTC timescale

Conflicts:
	tests/measure_t24p.c

wrc_ptp.c: enable PPS output after successful mode setting in Master/Gm mode, added wrc_ptp_get_mode()

wrc_main: workaround for all those who want to test WRPC in default configuration without calibration data stored in eeprom

Conflicts:
	wrc_main.c