arm: exynos: Add Exynos850 SoC support

Samsung Exynos850 is ARMv8-based mobile-oriented SoC. It features
Cortex-A55 CPU (8 cores) and it's built using 8nm process.

Add Exynos850 support by enabling next features:

  * Import Exynos850 SoC dtsi files from Linux kernel
  * Add Exynos850 MMU memory map
  * Introduce ARCH_EXYNOS9 platform config option

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
diff --git a/arch/arm/mach-exynos/Kconfig b/arch/arm/mach-exynos/Kconfig
index 8f3aee0..45fc6bb 100644
--- a/arch/arm/mach-exynos/Kconfig
+++ b/arch/arm/mach-exynos/Kconfig
@@ -58,6 +58,15 @@
 	  Cortex-A53 CPU (and some in a big.LITTLE configuration). There are
 	  multiple SoCs in this family including Exynos7420.
 
+config ARCH_EXYNOS9
+	bool "Exynos9 SoC family"
+	select ARM64
+	select BLK
+	select DM_MMC
+	help
+	  Samsung Exynos9 SoC family are based on ARMv8 Cortex CPU. There are
+	  multiple SoCs in this family including Exynos850.
+
 endchoice
 
 if ARCH_EXYNOS4