thermal: rcar_gen3: Add Renesas R-Car Gen3/Gen4 and RZ/G2 thermal driver

thermal: rcar_gen3: Add Renesas R-Car Gen3/Gen4 and RZ/G2 thermal driver

Add support for R-Car Gen3/Gen4 and RZ/G2 thermal sensors.
Fuse readout support is present, including fallback trimming.

Example usage using the 'temperature' command on R-Car V4H Sparrow Hawk:

"
=> temperature list
| Device                        | Driver                        | Parent
| thermal-rcar-gen3-tsc.0       | thermal-rcar-gen3-tsc         | thermal@e6198000
| thermal-rcar-gen3-tsc.1       | thermal-rcar-gen3-tsc         | thermal@e6198000
| thermal-rcar-gen3-tsc.2       | thermal-rcar-gen3-tsc         | thermal@e6198000
| thermal-rcar-gen3-tsc.3       | thermal-rcar-gen3-tsc         | thermal@e6198000

=> for i in 0 1 2 3 ; do temperature get thermal-rcar-gen3-tsc.$i ; done
thermal-rcar-gen3-tsc.0: 56 C
thermal-rcar-gen3-tsc.1: 50 C
thermal-rcar-gen3-tsc.2: 48 C
thermal-rcar-gen3-tsc.3: 52 C
"

Ported from Linux 6.16-rc6 commit
9e1dc0360fcf ("thermal/drivers/rcar_gen3: Add support for R-Car V4H default trim values")

Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org>