[ARM] Make ARMv5 architecture select ARMv4 rather than ARMv3 IO.

The selection of v3 or v4 IO string functions was dependent on
CONFIG_CPU_32v4, which meant that ARMv5 CPUs selected the v3 versions.
Make v5 CPUs select v4 versions.

arch/arm/lib/Makefile

@@ -26,12 +26,12 @@ obj-edb7211	:= io-acorn.o
 
 obj-y		+= $(obj-$(MACHINE))
 
-ifeq ($(CONFIG_CPU_32v4),y)
-  v3		:= n
-  v4		:= y
-else
+ifeq ($(CONFIG_CPU_32v3),y)
   v3		:= y
   v4		:= n
+else
+  v3		:= n
+  v4		:= y
 endif
 
 obj-y		+= io-readsb.o io-writesb.o