board: hexiwear_kw40z: Fix I2C dts info

When we introduced I2C DTS support on hexiwear_kw40z we got it wrong.
Its I2C1 not I2C0 that was being used on the hexiwear.  Fix the dts and
fixup file to reflect that.

Signed-off-by: Kumar Gala <kumar.gala@linaro.org>
2 files changed