switch to using QSPI bus for external flash

variants/thinknode_m1/platformio.ini

@@ -80,6 +80,7 @@ build_flags =
   -D OFFLINE_QUEUE_SIZE=256
   -D PIN_BUZZER=6
   -D AUTO_SHUTDOWN_MILLIVOLTS=3300
+  -D QSPIFLASH=1
 ;  -D MESH_PACKET_LOGGING=1
 ;  -D MESH_DEBUG=1
 build_src_filter = ${ThinkNode_M1.build_src_filter}