thermal: qcom-spmi-temp-alarm: add support for threshold set configuration

Add support for configuring the temperature threshold set which
defines the thresholds for over-temperature stages 1, 2, and 3.

Change-Id: I9e3cdbeadb10af59906dd01a16f04a87ba10fda6
Signed-off-by: David Collins <collinsd@codeaurora.org>