spi: update bindings for MT8192 SoC

Add a DT binding documentation for the MT8192 soc.

Signed-off-by: leilk.liu <leilk.liu@mediatek.com>
Link: https://lore.kernel.org/r/20200721122436.31544-1-leilk.liu@mediatek.com
Signed-off-by: Mark Brown <broonie@kernel.org>
1 file changed