Add i2c compatible for MT7622. Compare to MT8173 i2c controller,
MT7622 limits message numbers to 255, and does not support 4GB
DMA mode.
Signed-off-by: NJun Gao <jun.gao@mediatek.com>
Reviewed-by: NYingjoe Chen <yingjoe.chen@mediatek.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>