i2c: rk_i2c: Add div and data hold time adapter

For 400k frequency division, 1:1 is incorrect,
change to automatic frequency division.

Change-Id: I9ed7c6f2cbe45222ce820c9af3031dd7114e1fab
Signed-of

i2c: rk_i2c: Add div and data hold time adapter

For 400k frequency division, 1:1 is incorrect,
change to automatic frequency division.

Change-Id: I9ed7c6f2cbe45222ce820c9af3031dd7114e1fab
Signed-off-by: David Wu <david.wu@rock-chips.com>

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Merge git://git.denx.de/u-boot-rockchip

rockchip: Add I2C driver

Add an I2C driver for the Rockchip RK3288, using driver model. It should work
for other Rockchip SoCs also.

Signed-off-by: Simon Glass <sjg@chromium.org>