Initial changes to compile for Luckfox Pico Pro Max (256MB SPI NAND storage)

[greenbreakfast]

Changes:

• updated rockchip image target to setup ubi and nand flash support
• updated rockchip rv1106 u-boot makefile to support creating sfc (SPI NOR/NAND) bootloader image for the Pico Pro Max, added the luckfox_pico-86panel-w device specifically to the emmc bootloader config to maintain working tree for that device
  • the makefile already featured a luckfox_pico-max-sfc device but this device isn't mentioned elsewhere
• Updated luckfox pico pro max DTS and DTSI files to define proper bootargs and disable extra hardware that is not required for the very first working build

Status:

• openwrt compiles with this setup
• when kernel is flashed to device: kernel starts and crashes when trying to mount rootfs (as expected since there is no NAND, UBI, or UBIFS support in the kernel)

Next steps:

• Add SPI NAND, UBI, and UBIFS support to the kernel
  • Currently, when recompiling with these changes, the kernel doesn't start on the device - actively debugging this issue