meta-google: nftables: adjust address

Some of our platforms uses fd1x addr, this corrects the rules.

Change-Id: I25eab10c40409bc6d9e3758ffffba4b2d0c3a957
Signed-off-by: Yuxiao Zhang <yuxiaozhang@google.com>
diff --git a/meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-nft.sh b/meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-nft.sh
index 7aa2158..79ea76f 100644
--- a/meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-nft.sh
+++ b/meta-google/recipes-google/networking/gbmc-bridge/gbmc-br-nft.sh
@@ -57,8 +57,11 @@
     if (( ip_bytes[8] != 0xfd )); then
       return 0
     fi
+
+    (( ip_bytes[9] &= 0xf0 ))
+
     local i
-    for (( i=9; i<16; i++ )); do
+    for (( i=10; i<16; i++ )); do
       ip_bytes["$i"]=0
     done
     pfx="$(ip_bytes_to_str ip_bytes)/76"