linux-imx

gpio: it87: Add support for IT8613

This was tested on actual hardware and found to work fine, but currently
the official specifications of this chip could not be obtained to
confirm the numbers.

Signed-off-by: Leonid Bloch <lbloch@janustech.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>