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/esp32s3/ELECROW-ThinkNode-M5/platformio.ini

@@ -34,3 +34,5 @@ lib_deps = ${esp32s3_base.lib_deps}
   https://github.com/meshtastic/GxEPD2/archive/a05c11c02862624266b61599b0d6ba93e33c6f24.zip
   # renovate: datasource=custom.pio depName=PCA9557-arduino packageName=maxpromer/library/PCA9557-arduino
   maxpromer/PCA9557-arduino@1.0.0
+  # renovate: datasource=custom.pio depName=SensorLib packageName=lewisxhe/library/SensorLib
+  lewisxhe/SensorLib@0.3.4

variants/esp32s3/ELECROW-ThinkNode-M5/variant.cpp

@@ -1,12 +1,17 @@
 #include "variant.h"
 #include <PCA9557.h>
 
-PCA9557 io(0x18, &Wire);
+PCA9557 io(0x18, &Wire1);
 
 void earlyInitVariant()
 {
-    Wire.begin(48, 47);
+    Wire1.begin(48, 47);
     io.pinMode(PCA_PIN_EINK_EN, OUTPUT);
     io.pinMode(PCA_PIN_POWER_EN, OUTPUT);
     io.digitalWrite(PCA_PIN_POWER_EN, HIGH);
 }
+
+void variant_shutdown()
+{
+    io.digitalWrite(PCA_PIN_POWER_EN, LOW);
+}

variants/esp32s3/ELECROW-ThinkNode-M5/variant.h

@@ -30,6 +30,9 @@
 #define I2C_SCL 1
 #define I2C_SDA 2
 
+// PCF8563 RTC Module
+#define PCF8563_RTC 0x51
+
 // GPS pins
 #define GPS_SWITH 10
 #define HAS_GPS 1