[POWERPC] Rename prom_n_addr_cells to of_n_addr_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/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
index ff87b1a..54e93eb 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -139,7 +139,7 @@
 	struct mpic *mpic;
 
 	np = of_find_node_by_path("/");
-	naddr = prom_n_addr_cells(np);
+	naddr = of_n_addr_cells(np);
 	opprop = get_property(np, "platform-open-pic", &opplen);
 	if (opprop != 0) {
 		openpic_addr = of_read_number(opprop, naddr);
@@ -193,7 +193,7 @@
 					    NULL);
 		if (addrp == NULL)
 			continue;
-		naddr = prom_n_addr_cells(np);
+		naddr = of_n_addr_cells(np);
 		intack = addrp[naddr-1];
 		if (naddr > 1)
 			intack |= ((unsigned long)addrp[naddr-2]) << 32;