arm: add support for Hisilicon HiSTB family SoCs

First supported chip is hi3798mv200 (which is similar to Hi3798cv200
used by poplar).

Signed-off-by: Yang Xiwen <forbidden405@outlook.com>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index fdb24d6..99264a6 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -578,6 +578,16 @@
 	help
 	  Support for TI's DaVinci platform.
 
+config ARCH_HISTB
+	bool "Hisilicon HiSTB SoCs"
+	select DM
+	select DM_SERIAL
+	select OF_CONTROL
+	select PL01X_SERIAL
+	imply CMD_DM
+	help
+	  Support for HiSTB SoCs.
+
 config ARCH_KIRKWOOD
 	bool "Marvell Kirkwood"
 	select ARCH_MISC_INIT
@@ -2174,6 +2184,8 @@
 
 source "arch/arm/mach-highbank/Kconfig"
 
+source "arch/arm/mach-histb/Kconfig"
+
 source "arch/arm/mach-integrator/Kconfig"
 
 source "arch/arm/mach-ipq40xx/Kconfig"