ARM: aspeed: Add ASPEED AST2600 architecture

The AST2600 is a Cortex A7 dual core CPU that uses the ARM GIC for
interrupts and ARM timer as a clocksource.
Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Joel Stanley <joel@jms.id.au>

arch/arm/mach-aspeed/Kconfig

 # SPDX-License-Identifier: GPL-2.0-only
 menuconfig ARCH_ASPEED
 	bool "Aspeed BMC architectures"
-	depends on ARCH_MULTI_V5 || ARCH_MULTI_V6
+	depends on ARCH_MULTI_V5 || ARCH_MULTI_V6 || ARCH_MULTI_V7
 	select SRAM
 	select WATCHDOG
 	select ASPEED_WATCHDOG
@@ -33,4 +33,16 @@ config MACH_ASPEED_G5
 	 Say yes if you intend to run on an Aspeed ast2500 or similar
 	 fifth generation Aspeed BMCs.
 
+config MACH_ASPEED_G6
+	bool "Aspeed SoC 6th Generation"
+	depends on ARCH_MULTI_V7
+	select CPU_V7
+	select PINCTRL_ASPEED_G6
+	select ARM_GIC
+	select HAVE_ARM_ARCH_TIMER
+	select HAVE_SMP
+	help
+	 Say yes if you intend to run on an Aspeed ast2600 or similar
+	 sixth generation Aspeed BMCs.
+
 endif