ARM: dts: add I2C block in GSBI12

The I2C block on the GSBI12 is used on the APQ8060 Dragonboard for
sensors. Make it available in the chipset file.

Take this opportunity to fix the IRQ flag "0" to "NONE" using the
IRQ DT include.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>