Change in coreboot[master]: soc/intel/../thermal: Use `thermal_rmw32` API for setting LTT

[Subrata Banik (Code Review)]

Attention is currently required from: Maulik V Vaghela, Tim Wawrzynczak, Angel Pons, Patrick Rudolph.
Subrata Banik has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/59310 )

Change subject: soc/intel/../thermal: Use `thermal_rmw32` API for setting LTT
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Patch Set 1:

(1 comment)

Commit Message:

https://review.coreboot.org/c/coreboot/+/59310/comment/cff1a82d_09110edc 
PS1, Line 12: Also, modified `pch_get_ltt_value()` return type from uint16_t to
            : uint32_t
> Changing this type should be a separate change. It should be easier to do before this change.

Sure Angel, i have thought that but later ignored, but make sense. Will update the CL.