msm: thermal: Revert devm_kzalloc to kzalloc in sensor manager APIs

Sensor manager APIs uses devm_kzalloc to allocate memory for
thresholds. If probe is deferred, device related memory releases.
Later during re-probe, driver doesn't re-initialize all thresholds
which was successsful during first probe, which causes unexpected
values in previously initialized thresholds. Revert devm_kzalloc and
devm_kfree to kzalloc and kfree respectively in sensor manager APIs.

Change-Id: If1f39274e97c201d542b02fd501dbf60fac87de9
Signed-off-by: Manaf Meethalavalappu Pallikunhi <manafm@codeaurora.org>