driver: thermal: qmi_cdev: Add support for DSC mitigation

Modem supports new DSC based mitigation nodes, which are not timer
based. Add support for these new TMD devices to be registered as cooling
devices in thermal framework.

Change-Id: I4673aa80029804ff4fa8104d4e04651c3d825e48
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>