RP2040 Enter uf2 DFU mode (#3062)

* Pico enter dfu mode

* Ungaurd pico

src/modules/AdminModule.cpp

@@ -190,7 +190,7 @@ bool AdminModule::handleReceivedProtobuf(const meshtastic_MeshPacket &mp, meshta
     }
     case meshtastic_AdminMessage_enter_dfu_mode_request_tag: {
         LOG_INFO("Client is requesting to enter DFU mode.\n");
-#ifdef ARCH_NRF52
+#if defined(ARCH_NRF52) || defined(ARCH_RP2040)
         enterDfuMode();
 #endif
         break;

src/platform/rp2040/main-rp2040.cpp

@@ -35,4 +35,9 @@ void rp2040Setup()
        Taken from CPU cycle counter and ROSC oscillator, so should be pretty random.
     */
     randomSeed(rp2040.hwrand32());
+}
+
+void enterDfuMode()
+{
+    reset_usb_boot(0, 0);
 }