[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/spider_net.c b/drivers/net/spider_net.c
index 230da14..c15e972 100644
--- a/drivers/net/spider_net.c
+++ b/drivers/net/spider_net.c
@@ -1830,7 +1830,7 @@
 	if (!dn)
 		goto out_err;
 
-	fw_prop = get_property(dn, "firmware", &fw_size);
+	fw_prop = of_get_property(dn, "firmware", &fw_size);
 	if (!fw_prop)
 		goto out_err;
 
@@ -2236,7 +2236,7 @@
 	if (!dn)
 		return -EIO;
 
-	mac = get_property(dn, "local-mac-address", NULL);
+	mac = of_get_property(dn, "local-mac-address", NULL);
 	if (!mac)
 		return -EIO;
 	memcpy(addr.sa_data, mac, ETH_ALEN);