include/linux/i2c is not for client devices.

Move the header file to a more appropriate location.
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>
Acked-by: NDaniel Thompson <daniel.thompson@linaro.org>
Acked-by: NMichael Hennerich <michael.hennerich@analog.com>
Signed-off-by: NLee Jones <lee.jones@linaro.org>