wspoon: Update I2C hwmon paths for the 5.0 kernel

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: I23522efab7f829c3117f07a31c17bb2612e96c1c
12 files changed