arm64: add ZTE ZX SoC family

This patch introduces ARCH_ZX to add the support of the ZTE ZX SoC
family for the arm64 architecture.
Signed-off-by: NJun Nie <jun.nie@linaro.org>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

arch/arm64/Kconfig.platforms

@@ -204,6 +204,11 @@ config ARCH_XGENE
 	help
 	  This enables support for AppliedMicro X-Gene SOC Family
 
+config ARCH_ZX
+	bool "ZTE ZX SoC Family"
+	help
+	  This enables support for ZTE ZX SoC Family
+
 config ARCH_ZYNQMP
 	bool "Xilinx ZynqMP Family"
 	help