thermal: qcom-spmi-temp-alarm: Add support for thaw callback

Hibernation may fail after this driver's freeze
callback. Implement thaw callback to undo the
changes done in freeze callback.

Change-Id: I10c3b8a36986f7971c78bb14a88bf5a228a516ae
Signed-off-by: Atul Raut <araut@codeaurora.org>