spi: airoha: Add Airoha SPI NAND driver

Add Airoha SPI NAND driver to permit usage of attached SNAND on the
Airoha AN7581 SoC. While SPI controller supports DMA transation, due to
U-Boot limitation we currently limit it to single command in Manual
mode.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
3 files changed