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