Add fan control events for mowgli will adjust the fan speed according
to core, dimm, and some sensors.

Signed-off-by: Ben Pai <Ben_Pai@wistron.com>

1.Add fan error detection
2.Add power supply policy
3.Add thermal policy: When the cpu core temperature exceeds 95 degrees
  or the ambient exceeds 45 degrees, it will automatically shutdowm.

Mowgli only needs fan*_0 to control the fan speed.

Signed-off-by: Ben Pai <Ben_Pai@wistron.com>

When more than two fan enclosures, the system will shut down.

Signed-off-by: Ben Pai <Ben_Pai@wistron.com>

We found that the fan sourcecode of op940 still needs a cooling type.
There must be a cooling type under system/chassis.

Signed-off-by: Ben Pai <Ben_Pai@wistron.com>