Support for Asus ZenWiFi BT8 Tri-band Wifi7 (Mediatek MT7988)

[remittor]

@Pulver

MT7988> fdt rm /signature; bootm

This is not a good idea.
I want the bootloader to load the image from NAND into memory itself.

@Pulver

Please choose the operation: 
   1: Load System code to SDRAM via TFTP.
   2: Load System code then write to Flash via TFTP.

Use choose 2 to install the image to NAND.
Example: Asus TUF AX4200 support - #189 by remittor