[dw-i2c] Migrate to use mmio_buffer_t. Tested: Compiles. Change-Id: I2cdce1142076e196ae6b5037394ca980db553afb
[dev][i2c][dw-i2c] Move hikey960 I2C support into a separate driver Also reenabled I2C and DSI support in the hikey build Change-Id: I91dcaab2f2ab124939e9270a9b6ffaedb76ced45