Import pending patches to set pinconf settings for SPI-NAND pins on
MT7622 identical to what the old proprietary preloader did.
Should further increase the reliability of some SNFI-attached SPI-NAND
flash chips.
Link: https://github.com/mtk-openwrt/arm-trusted-firmware/pull/7
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
