[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/mpc52xx_uart.c b/drivers/serial/mpc52xx_uart.c
index 8d24cd5..f8c1761 100644
--- a/drivers/serial/mpc52xx_uart.c
+++ b/drivers/serial/mpc52xx_uart.c
@@ -1069,7 +1069,7 @@
 			continue;
 
 		/* Is a particular device number requested? */
-		devno = get_property(np, "port-number", NULL);
+		devno = of_get_property(np, "port-number", NULL);
 		mpc52xx_uart_of_assign(of_node_get(np), devno ? *devno : -1);
 	}