thermal: rcar_thermal: update calculation formula for R-Car Gen3 SoCs

Update calculation for the R-Car Gen3 and RZ/G2 SoCs which have a
thermal IP block controlled by this driver. That is the:

* R-Car D3 (r8a77995)
* R-Car E2 (r8a77990)
* R-Car V3M (r8a77970)
* RZ/G2E (r8a774c0)

The calculation update is as documented in the R-Car Gen3 User's Manual,
v1.50 Nov 2018:

- When CTEMP is less than 24
   T = CTEMP[5:0] * 5.5 - 72
- When CTEMP is equal to/greater than 24
   T = CTEMP[5:0] * 5 - 60

This was inspired by a patch in the BSP by Van Do <[email protected]>

Signed-off-by: Yoshihiro Kaneko <[email protected]>
Tested-by: Simon Horman <[email protected]>
Acked-by: Wolfram Sang <[email protected]>
Reviewed-by: Niklas Söderlund <[email protected]>
Signed-off-by: Simon Horman <[email protected]>
Signed-off-by: Eduardo Valentin <[email protected]>

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