meta-ibm: Adjust mihawk's power sensor

1.Correct the channel of mihawk total power sensor
2.The current mihawk is not used to external gpu power.
  Avoid confusing users so delete this sensor.

Change-Id: I3053aa9521fa4263f1e570034f7550fc593efb0c
Signed-off-by: Ben Pai <Ben_Pai@wistron.com>
1 file changed