thermal/drivers/rcar_gen3: Move Tj_T storage to shared private data

The calculated Tj_T constant is calculated from the PTAT data either
read from the first TSC zone on the device if calibration data is fused,
or from fallback values in the driver itself. The value calculated is
shared among all TSC zones.

Move the Tj_T constant to the shared private data structure instead of
duplicating it in each TSC private data. This requires adding a pointer
to the shared data to the TSC private data structure. This back pointer
make it easier to further rework the temperature conversion logic.

Signed-off-by: Niklas Söderlund <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Daniel Lezcano <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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