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-M6/platformio.ini

@@ -21,5 +21,5 @@ build_flags = ${nrf52840_base.build_flags}
 build_src_filter = ${nrf52_base.build_src_filter} +<../variants/nrf52840/ELECROW-ThinkNode-M6>
 lib_deps =
   ${nrf52840_base.lib_deps}
-  ; # 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-M6/variant.h

@@ -121,7 +121,6 @@ static const uint8_t A0 = PIN_A0;
 
 // PCF8563 RTC Module
 #define PCF8563_RTC 0x51
-#define HAS_RTC 1
 
 // SPI
 #define SPI_INTERFACES_COUNT 1