sparc: Mark prom_early_alloc non-static.

A subsequent changeset will use this.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/kernel/prom.h b/arch/sparc/kernel/prom.h
index dce53de2..b7258ce 100644
--- a/arch/sparc/kernel/prom.h
+++ b/arch/sparc/kernel/prom.h
@@ -7,4 +7,6 @@
 extern struct device_node *allnodes;	/* temporary while merging */
 extern rwlock_t devtree_lock;	/* temporary while merging */
 
+extern void * prom_early_alloc(unsigned long size);
+
 #endif /* __PROM_H */