Modprobe qspi_mtd can't find node /dev/mtd on Orin NX

That could be only accessed by RCM boot.

In brief, we don’t allow user to change files on QSPI anymore. If you want to update something, please follow the official way to update it from UEFI.

https://docs.nvidia.com/jetson/archives/r35.2.1/DeveloperGuide/text/SD/Bootloader/UpdateAndRedundancy.html?highlight=capsule#generating-the-capsule-update-payload