msm: thermal: Don't initialize hotplug thread when not configured

Do not initialize the hotplug thread if the device tree
entry for hotplug thresholds are missing for a target.

CRs-fixed: 580249
Change-Id: I8ed99a757a2bd66a6a669ad78d7c4fe632b56012
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>
Signed-off-by: Anji Jonnala <anjir@codeaurora.org>

Conflicts:
	drivers/thermal/msm_thermal.c
msm: thermal: Add support for emergency frequency mitigation

Add emergency frequency mitigation support to Kernel Thermal
Monitor (KTM). This feature enables KTM to mitigate the
cpu's max frequency when the temperature crosses the preset
threshold.

CRs-Fixed: 538981
Change-Id: I756e82e577b19c18f32b3297aa97fa2942d8b77d
Signed-off-by: Ram Chandrasekar <rkumbako@codeaurora.org>

Conflicts:
	drivers/thermal/msm_thermal.c

Conflicts:
	drivers/thermal/msm_thermal.c