[POWERPC] Rename get_property to of_get_property: drivers

These are all the remaining instances of get_property.  Simple rename of
get_property to of_get_property.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/drivers/serial/of_serial.c b/drivers/serial/of_serial.c
index 09b0b73..e7928fe 100644
--- a/drivers/serial/of_serial.c
+++ b/drivers/serial/of_serial.c
@@ -29,8 +29,8 @@
 	int ret;
 
 	memset(port, 0, sizeof *port);
-	spd = get_property(np, "current-speed", NULL);
-	clk = get_property(np, "clock-frequency", NULL);
+	spd = of_get_property(np, "current-speed", NULL);
+	clk = of_get_property(np, "clock-frequency", NULL);
 	if (!clk) {
 		dev_warn(&ofdev->dev, "no clock-frequency property set\n");
 		return -ENODEV;