Port nRF54L15 to the s145 SoftDevice Arduino core (#11842)

* Remove the Zephyr based nRF54L15 port

* Add nRF54L15 port on the s145 Arduino core: nrf54l15dk and xiao_nrf54l15 variants

* nRF54L: errno-style nrfx results, flush console before assert reset

* nRF54L: log the SoftDevice status on Bluefruit failure, ignore the seed request event

* Support the Wio-LR2021 LoRa Plus expansion board with OLED and K1 on the XIAO nRF54L15 variant

* Consume the nRF54L15 platform, core and bootloader from their repositories

* Pin the nRF54L15 platform to v0.2.0

* nRF52: forward SoftDevice flash events taken by the main loop to the flash driver, log the pairing failure status

* Pin the nRF54L15 platform to v0.2.1

* Pin the nRF54L15 platform to v0.3.0

* Split the XIAO nRF54L15 variant into SX1262 and LoRa Plus environments, seed the SoftDevice on request, add the nrf54l15 CI build script

* Pin the nRF54L15 platform to meshtastic/platform-nordicnrf54 v0.3.1

* NRF54: Fix mtjson generation

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Co-authored-by: vidplace7 <vidplace7@gmail.com>

src/RedirectablePrint.cpp

@@ -235,8 +235,6 @@ void RedirectablePrint::log_to_ble(const char *logLevel, const char *format, va_
         isBleConnected = nimbleBluetooth && nimbleBluetooth->isActive() && nimbleBluetooth->isConnected();
 #elif defined(ARCH_NRF52)
         isBleConnected = nrf52Bluetooth != nullptr && nrf52Bluetooth->isConnected();
-#elif defined(ARCH_NRF54L15)
-        isBleConnected = nrf54l15Bluetooth != nullptr && nrf54l15Bluetooth->isConnected();
 #endif
         if (isBleConnected) {
             auto thread = concurrency::OSThread::currentThread;
@@ -253,8 +251,6 @@ void RedirectablePrint::log_to_ble(const char *logLevel, const char *format, va_
             nimbleBluetooth->sendLog(buffer.get(), size);
 #elif defined(ARCH_NRF52)
             nrf52Bluetooth->sendLog(buffer.get(), size);
-#elif defined(ARCH_NRF54L15)
-            nrf54l15Bluetooth->sendLog(buffer.get(), size);
 #endif
         }
     }