fix(board): Add missing upload flags and extra_flags

Author: P-R-O-C-H-Y

boards.txt

@@ -42286,6 +42286,8 @@ nano_nora.upload.tool.network=esp_ota
 nano_nora.upload.protocol=serial
 nano_nora.upload.maximum_size=3145728
 nano_nora.upload.maximum_data_size=327680
+nano_nora.upload.flags=
+nano_nora.upload.extra_flags=
 nano_nora.upload.use_1200bps_touch=false
 nano_nora.upload.wait_for_upload_port=false