[POWERPC] Rename prom_n_size_cells to of_n_size_cells

This is more consistent and gets us closer to the Sparc code.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 08d6197..2890ce3 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -1056,8 +1056,7 @@
 }
 EXPORT_SYMBOL(of_n_addr_cells);
 
-int
-prom_n_size_cells(struct device_node* np)
+int of_n_size_cells(struct device_node* np)
 {
 	const int* ip;
 	do {
@@ -1070,7 +1069,7 @@
 	/* No #size-cells property for the root node, default to 1 */
 	return 1;
 }
-EXPORT_SYMBOL(prom_n_size_cells);
+EXPORT_SYMBOL(of_n_size_cells);
 
 /**
  * Construct and return a list of the device_nodes with a given name.