spi: dt-bindings: samsung: Add Exynos850 SPI

Document samsung,exynos850-spi compatible which will be used on
Exynos850 SoC. Exynos850 doesn't have ioclk, so only two clocks are
needed (bus clock and functional SPI clock).
Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://msgid.link/r/20240120012948.8836-3-semen.protsenko@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/spi/samsung,spi.yaml

@@ -22,6 +22,7 @@ properties:
           - samsung,s5pv210-spi # for S5PV210 and S5PC110
           - samsung,exynos4210-spi
           - samsung,exynos5433-spi
+          - samsung,exynos850-spi
           - samsung,exynosautov9-spi
           - tesla,fsd-spi
       - const: samsung,exynos7-spi