Statically link SystemMessageProto into wifi-service

Statically link SystemMessagesProto since Wifi
uses a few constants defined here e.g.
NOTE_NETWORK_NO_MAC_RANDOMIZATION_SUPPORT,
NOTE_NETWORK_AVAILABLE, etc.

Proto should ensure backwards compatibility of
these constants.

Bug: 147387246
Test: compiles
Change-Id: Id6e704fa50e3500d191ecfa57cbb5a237dfaf01a

proto/Android.bp

@@ -27,3 +27,8 @@ java_library_static {
     srcs: ["src/metrics_constants/metrics_constants.proto"],
     sdk_version: "system_current",
 }
+
+filegroup {
+    name: "system-messages-proto-src",
+    srcs: ["src/system_messages.proto"],
+}

wifi/jarjar-rules.txt

@@ -23,6 +23,8 @@ rule android.os.BasicShellCommandHandler* com.android.server.x.wifi.os.BasicShel
 rule org.bouncycastle.** com.android.server.x.wifi.bouncycastle.@1
 # Use our statically linked protobuf library
 rule com.google.protobuf.** com.android.server.x.wifi.protobuf.@1
+# use statically linked SystemMessageProto
+rule com.android.internal.messages.SystemMessageProto* com.android.server.x.wifi.messages.SystemMessageProto@1
 # Use our statically linked PlatformProperties library
 rule android.sysprop.** com.android.server.x.wifi.sysprop.@1