thermal/core: Create a helper __thermal_cdev_update() without a lock

There is a need to have a helper function which updates cooling device
state from the governors code. With this change governor can use
lock and unlock while calling helper function. This avoid unnecessary
second time lock/unlock which was in previous solution present in
governor implementation. This new helper function must be called
with mutex 'cdev->lock' hold.

The changed been discussed and part of code presented in thread:
https://lore.kernel.org/linux-pm/[email protected]/

Co-developed-by: Daniel Lezcano <[email protected]>
Signed-off-by: Daniel Lezcano <[email protected]>
Signed-off-by: Lukasz Luba <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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