drivers: thermal: bcl_pmic5: Incorporate thermometer encoding

The BCL hardware doesn't notify the HLOS on thermometer encoded format.
This can lead to a situation where a higher vbat or ibat violation gets
triggered, but the lower violation doesn't.

Update the interrupt handling to handle this case. The irq handler will
notify the lower violation routine to mimic the thermometer encoding.

Change-Id: I3e6d1461a9085bc737d4a5ed2226124c0c1f87a2
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>