meta-ibm: Adjust the mihawk fan control event

According to our thermal team test report, we need to adjust the fan
control event.

Tested
Fan speed will be based on new fan control events.

Signed-off-by: Ben Pai <Ben_Pai@wistron.com>
Change-Id: Ic8051bf3a059e3d4a9f31040d31100bd69c6648c
2 files changed