This patch adds support for the Diolan DLN-2 I2C master module. Due
to hardware limitations it does not support SMBUS quick commands.

Information about the USB protocol interface can be found in the
Programmer's Reference Manual [1], see section 6.2.2 for the I2C
master module commands and responses.

[1] https://www.diolan.com/downloads/dln-api-manual.pdfSigned-off-by: NLaurentiu Palcu <laurentiu.palcu@intel.com>
Signed-off-by: NOctavian Purdila <octavian.purdila@intel.com>
Acked-by: NWolfram Sang <wsa@the-dreams.de>
Reviewed-by: NJohan Hovold <johan@kernel.org>
[Lee: Fixed some whitespace issues in Kconfig]
Signed-off-by: NLee Jones <lee.jones@linaro.org>