Add an interrupt driven i2c driver for gd32 i2c peripheral.
The transmit and reception method refer from GD32 SoCs user manual.
Particularly, reception method choose the solution B.
There have some wait for state ready logic in the driver. It cause by
i2c device internal state change slower than i2c driver.
Signed-off-by: HaiLong Yang <cameledyang@pm.me>
HaiLong Yang