Add a class to build IPv4 TCP packet

Note that IPv4 and TCP options are not supported.

Test: atest NetworkStaticLibTests

Change-Id: Ie62b95bf759b74d72a5e85d312d17978422f633b
diff --git a/staticlibs/Android.bp b/staticlibs/Android.bp
index 0585c09..4c58228 100644
--- a/staticlibs/Android.bp
+++ b/staticlibs/Android.bp
@@ -139,6 +139,7 @@
     srcs: [
         "device/com/android/net/module/util/HexDump.java",
         "device/com/android/net/module/util/Ipv6Utils.java",
+        "device/com/android/net/module/util/PacketBuilder.java",
         "device/com/android/net/module/util/Struct.java",
         "device/com/android/net/module/util/structs/*.java",
     ],