sparc: unify kernel/cpu

o use cpu_32.c as base
o move all sparc64 definitions to the common cpu.c
o use ifdef for the parts that differs and use cpu_32 as base
o spitfire.h required a CONFIG_SPARC64 guard to fix build on 32 bit

Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/kernel/Makefile b/arch/sparc/kernel/Makefile
index 04c74d0..0ba314b 100644
--- a/arch/sparc/kernel/Makefile
+++ b/arch/sparc/kernel/Makefile
@@ -27,7 +27,7 @@
 obj-$(CONFIG_SPARC32)   += systbls_32.o
 obj-y                   += time_$(BITS).o
 obj-$(CONFIG_SPARC32)   += windows.o
-obj-y                   += cpu_$(BITS).o
+obj-y                   += cpu.o
 obj-$(CONFIG_SPARC32)   += devices.o
 obj-$(CONFIG_SPARC32)   += tadpole.o
 obj-$(CONFIG_SPARC32)   += tick14.o