Power off control pin on Thinknode m5 during deepsleep and add RTC (#9510)

* Power off control pin on Thinknode m5 during deepsleep

* Apply suggestion from @Copilot

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Finish HAS_RTC cleanup

* Add RTC for Thinknode M5

* Don't double-init Wire

* Specify the RTC chip directly rather than use SensorRtcHelper.
Saves a bit of flash, and avoid mis-detection

---------

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

variants/nrf52840/ELECROW-ThinkNode-M3/platformio.ini

@@ -24,5 +24,5 @@ lib_deps =
   ${nrf52840_base.lib_deps}
   # renovate: datasource=custom.pio depName=nRF52_PWM packageName=khoih-prog/library/nRF52_PWM
   khoih-prog/nRF52_PWM@1.0.1
-  ; # renovate: datasource=custom.pio depName=SensorLib packageName=lewisxhe/library/SensorLib
+  # renovate: datasource=custom.pio depName=SensorLib packageName=lewisxhe/library/SensorLib
   lewisxhe/SensorLib@0.3.4

variants/nrf52840/ELECROW-ThinkNode-M3/variant.h

@@ -116,7 +116,6 @@ extern "C" {
 
 // PCF8563 RTC Module
 #define PCF8563_RTC 0x51
-#define HAS_RTC 1
 
 #ifdef __cplusplus
 }