wspoon: Update eeprom I2C path 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: I3cd362e63100c535c9856ac301e17496346670df
1 file changed