sparc: Move property building code into prom_common.c

Unfortunately there is some sparc32/sparc64 ifdef'ery in
here due to the difference in how the prom_firstprop()
and prom_nextprop() routines work.

This will be eliminated eventually.

Signed-off-by: David S. Miller <davem@davemloft.net>

arch/sparc/kernel/prom.h

@@ -15,4 +15,6 @@ extern void irq_trans_init(struct device_node *dp);
 
 extern unsigned int prom_unique_id;
 
+extern struct property * __init build_prop_list(phandle node);
+
 #endif /* __PROM_H */