sparc: Create common area for OF device layer code.

This is where common code implementations will go as we unify
32-bit and 64-bit OF device tree code.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/kernel/Makefile b/arch/sparc/kernel/Makefile
index cd13d7f..d0d63b1 100644
--- a/arch/sparc/kernel/Makefile
+++ b/arch/sparc/kernel/Makefile
@@ -35,6 +35,7 @@
 obj-y                   += unaligned_$(BITS).o
 obj-y                   += una_asm_$(BITS).o
 obj-$(CONFIG_SPARC32)   += muldiv.o
+obj-y                   += prom_common.o
 obj-y                   += prom_$(BITS).o
 obj-y                   += of_device_$(BITS).o