MN10300: Add CPU register bits for AM34

Add CPU register declarations for the AM34 subarch.

Signed-off-by: Akira Takeuchi <takeuchi.akr@jp.panasonic.com>
Signed-off-by: Kiyoshi Owada <owada.kiyoshi@jp.panasonic.com>
Signed-off-by: David Howells <dhowells@redhat.com>
diff --git a/arch/mn10300/Kconfig b/arch/mn10300/Kconfig
index 275963e..eab0c2a 100644
--- a/arch/mn10300/Kconfig
+++ b/arch/mn10300/Kconfig
@@ -17,6 +17,7 @@
 
 config AM34_2
 	def_bool n
+	select MN10300_HAS_ATOMIC_OPS_UNIT
 
 config MMU
 	def_bool y
@@ -124,6 +125,12 @@
 
 endchoice
 
+config MN10300_HAS_ATOMIC_OPS_UNIT
+	def_bool n
+	help
+	  This should be enabled if the processor has an atomic ops unit
+	  capable of doing LL/SC equivalent operations.
+
 config FPU
 	bool "FPU present"
 	default y