[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/net/sungem_phy.c b/drivers/net/sungem_phy.c
index 56a110c..61843fd 100644
--- a/drivers/net/sungem_phy.c
+++ b/drivers/net/sungem_phy.c
@@ -451,7 +451,7 @@
 	if (phy->platform_data) {
 		struct device_node *np = of_get_parent(phy->platform_data);
 		int can_low_power = 1;
-		if (np == NULL || get_property(np, "no-autolowpower", NULL))
+		if (np == NULL || of_get_property(np, "no-autolowpower", NULL))
 			can_low_power = 0;
 		if (can_low_power) {
 			/* Enable automatic low-power */