driver: thermal: bcl_pmic5: Use mitigation level interrupts

BCL peripheral will eventually translate all the vbat and ibat
interrupts to mitigation level interrupts. And the interrupts also will
correspond to the levels instead of the vbat or ibat events. So use
these interrupts in HLOS to trigger mitigation.

The vbat and ibat will still be registered as sensors, but they wont
support interrupts and hence no mitigation for violation. Instead the
levels will be registered as interrupts and the mitigation config should
be based on this mitigation level sensor.

Change-Id: I45d2f63f2390eb4c59c45ca7d8aff758e1f88ce0
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>