ARM: virt: select ARM_AMBA

Guests can use AMBA bus devices such as the PL011 uart, so enable the
AMBA bus for mach-virt.
Signed-off-by: Rob Herring <robh@kernel.org>
Cc: Russell King <linux@arm.linux.org.uk>

arch/arm/Kconfig

@@ -931,9 +931,10 @@ endmenu
 
 config ARCH_VIRT
 	bool "Dummy Virtual Machine" if ARCH_MULTI_V7
+	select ARM_AMBA
 	select ARM_GIC
-	select HAVE_ARM_ARCH_TIMER
 	select ARM_PSCI
+	select HAVE_ARM_ARCH_TIMER
 
 #
 # This is sorted alphabetically by mach-* pathname.  However, plat-*