msm: thermal: Add MX voting in KTM

Add support to vote for a higher data retention voltage
than the preset value fox MX supply, when the temperature
crosses the low threshold of 5C. Remove the vote once the
temperature is above the set threshold.

CRs-fixed: 482114
Change-Id: I6c14ae8817f1a726d61e1dcebdb311cd89ccf452
Signed-off-by: Archana Sathyakumar <asathyak@codeaurora.org>