ARM: Prepare Actions Semi S500

Add ARCH_ACTIONS and mach-actions/owl.c for "actions,s500".

Signed-off-by: Andreas Färber <afaerber@suse.de>
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 65f4e2a..47d3a1a 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -151,6 +151,7 @@
 
 # Machine directory name.  This list is sorted alphanumerically
 # by CONFIG_* macro name.
+machine-$(CONFIG_ARCH_ACTIONS)		+= actions
 machine-$(CONFIG_ARCH_ALPINE)		+= alpine
 machine-$(CONFIG_ARCH_ARTPEC)		+= artpec
 machine-$(CONFIG_ARCH_AT91)		+= at91