SDK: new flash support instructions
Move the 473-mtd-m25p80-add-support-for-XTX-flash-and-undefined-flash.patch file to the target /target/linux/ar71xx/patches-3.18/ directory and re-compile the firmware.
Move the 473-mtd-m25p80-add-support-for-XTX-flash-and-undefined-flash.patch file to the target /target/linux/ar71xx/patches-3.18/ directory and re-compile the firmware.