Remove stale variant.h defines (#9470)

* Remove noop CANNED_MESSAGE_MODULE_ENABLE define

* Remove over-eager warning removal

* Remove unused LED_CONN

* Dead defines removal

* Rename oddball LED pin name

* Rename second oddball LED pin name

* Remove another dead define

variants/nrf52840/nano-g2-ultra/variant.h

@@ -50,8 +50,6 @@ extern "C" {
 #define LED_BLUE PIN_LED1
 #define LED_GREEN PIN_LED2
 
-#define LED_CONN PIN_GREEN
-
 #define LED_STATE_ON 0 // State when LED is lit
 
 /*
@@ -152,8 +150,6 @@ External serial flash W25Q16JV_IQ
 #define PIN_SPI_MOSI (0 + 11)
 #define PIN_SPI_SCK (0 + 12)
 
-// #define PIN_PWR_EN (0 + 6)
-
 // To debug via the segger JLINK console rather than the CDC-ACM serial device
 // #define USE_SEGGER