thermal/drivers/renesas/rcar: Add dependency on OF

The R-Car thermal driver depends on OF, describe this.
Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20240506154011.344324-3-niklas.soderlund+renesas@ragnatech.se

drivers/thermal/renesas/Kconfig

@@ -4,6 +4,7 @@ config RCAR_THERMAL
 	tristate "Renesas R-Car thermal driver"
 	depends on ARCH_RENESAS || COMPILE_TEST
 	depends on HAS_IOMEM
+	depends on OF
 	help
 	  Enable this to plug the R-Car thermal sensor driver into the Linux
 	  thermal framework.