soc: samsung: exynos-pmu: Add Exynos850 support

Exynos850 SoC can reuse PMU driver functionality. Add corresponding
compatible string.

Signed-off-by: Sam Protsenko <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Krzysztof Kozlowski <[e-mail]>

drivers/soc/samsung/exynos-pmu.c

···
 		.compatible = "samsung,exynos5433-pmu",
 	}, {
 		.compatible = "samsung,exynos7-pmu",
+	}, {
+		.compatible = "samsung,exynos850-pmu",
 	},
 	{ /*sentinel*/ },
 };