Add option to disable DS3231 RTC probe #1093

Job	Run time
build (RAK_4631_companion_radio_ble)	2m 27s
build (Heltec_v3_room_server)	2m 51s
build (Heltec_v3_companion_radio_ble)	2m 48s
build (Heltec_v3_repeater)	2m 50s
build (RAK_4631_room_server)	2m 16s
build (Tbeam_SX1276_repeater)	1m 58s
build (LilyGo_Tlora_C6_repeater_)	2m 2s
build (wio-e5-mini_repeater)	1m 54s
build (wio_wm1110_repeater)	2m 17s
build (PicoW_repeater)	2m 38s
build (RAK_4631_repeater)	2m 22s
	26m 23s

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