power: supply: qcom: implement die and connector health property

The die and connector health properties expose the comparator output of
the thermal regulation. If both die and skin temperature regulation is
enabled then the output of the comparator will be the higher of the two.
The property values can be one of: Unknown, Cool, Warm, Hot, Overheat.

Change-Id: Ic92c9cb08ec42fd2c2f26a54687a17e3b05b388f
Signed-off-by: Nicholas Troast <ntroast@codeaurora.org>