Add a U-Boot replacement loader for the TP-Link Archer BE450
(MT7988D, 128 MiB SPI-NAND). BL2 boots from spim-nand-ubi with DDR4;
the FIP and the redundant environment are stored in UBI volumes.
This replaces the vendor bootloader and the stock dual-image layout
with a single large UBI partition, freeing around 95 MiB of flash for
OpenWrt. The vendor layout keeps BL2 at flash offset 0x0, which is
where snand_write_bl2 places the first of its four redundant copies.
Signed-off-by: Emre Yavuzalp <emreyavuzalp2@gmail.com>
Link: https://github.com/openwrt/openwrt/pull/23211
Signed-off-by: Jonas Jelonek <jelonek.jonas@gmail.com>
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