msm: thermal: Add support for DDR frequency restriction to KTM

Add DDR frequency restriction feature to KTM. It restricts DDR
frequency by requesting pre-defined IB vote for DDR port through
bus driver APIs. Based on pre-defined tsens threshold temperature,
it requests or clears vote to DDR port.

It adds a new DT entry 'qcom,therm-ddr-lm-info' to KTM to enable this
feature and get required configs for this. KTM expects tsens id,
high threshold and low threshold respectively from this DT entry.

Change-Id: Ie687bfacd3d94b5bee15eef096000c2f63a79894
Signed-off-by: Manaf Meethalavalappu Pallikunhi <manafm@codeaurora.org>