Add IPv6 target link-layer option length definition

Bug: 337807604
Test: atest NetworkaStackTests:android.net.apf.ApfV5Test
Change-Id: I600dfb2c6deeb60d0559a4a318ab239e9d2ee481
diff --git a/staticlibs/framework/com/android/net/module/util/NetworkStackConstants.java b/staticlibs/framework/com/android/net/module/util/NetworkStackConstants.java
index 7c4abe0..19d8bbe 100644
--- a/staticlibs/framework/com/android/net/module/util/NetworkStackConstants.java
+++ b/staticlibs/framework/com/android/net/module/util/NetworkStackConstants.java
@@ -179,6 +179,7 @@
     public static final int ICMPV6_RA_HEADER_LEN = 16;
     public static final int ICMPV6_NS_HEADER_LEN = 24;
     public static final int ICMPV6_NA_HEADER_LEN = 24;
+    public static final int ICMPV6_ND_OPTION_TLLA_LEN = 8;
 
     public static final int NEIGHBOR_ADVERTISEMENT_FLAG_ROUTER    = 1 << 31;
     public static final int NEIGHBOR_ADVERTISEMENT_FLAG_SOLICITED = 1 << 30;