Fix callout I2C path

In the 5.0 Linux kernel, an I2C device path segment changed:
    i2c@1e78a000 -> bus@1e78a000

Signed-off-by: Matt Spinler <spinler@us.ibm.com>
Change-Id: I6eec4ca9d570d7c6eceac0338c88967a78907b48
1 file changed