i2c locking for rtc & timesync streamlined

include/globals.h

@@ -99,7 +99,6 @@ typedef struct {
 
 enum sendprio_t { prio_low, prio_normal, prio_high };
 enum timesource_t { _gps, _rtc, _lora, _unsynced };
-enum mutexselect_t { no_mutex, do_mutex };
 
 extern std::set<uint16_t, std::less<uint16_t>, Mallocator<uint16_t>> macs;
 extern std::array<uint64_t, 0xff>::iterator it;

include/rtctime.h

@@ -9,7 +9,7 @@
 extern RtcDS3231<TwoWire> Rtc; // make RTC instance globally available
 
 uint8_t rtc_init(void);
-uint8_t set_rtctime(time_t t, mutexselect_t mutex);
+uint8_t set_rtctime(time_t t);
 void sync_rtctime(void);
 time_t get_rtctime(void);
 float get_rtctemp(void);