i2c: headers: update docs about I2C_CLIENT_*

Update kerneldoc for i2c client flags because they increased over time.
Also, move them to a position where they can be more easily found.

Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Wolfram Sang 2019-06-03 10:25:34 +02:00
commit 2caea56f56