Add tapserver BBA and Modem Adapter UI config to Android

This PR simply exposes the tapserver options in Serial Port 1 on Android. They already exist and work, but are not selectable. I've tested the tapserver options myself with Phantasy Star Online Episode I & II and they work fine.

Source/Android/app/src/main/res/values/strings.xml

@@ -681,6 +681,8 @@ It can efficiently compress both junk data and encrypted Wii data.
     <!-- Slot SP1 Device selection -->
     <string name="broadband_adapter_xlink">Broadband Adapter (XLink Kai)</string>
     <string name="broadband_adapter_hle">Broadband Adapter (HLE)</string>
+    <string name="broadband_adapter_tapserver">Broadband Adapter (tapserver)</string>
+    <string name="modem_adapter_tapserver">Modem Adapter (tapserver)</string>
 
     <!-- Sound Mode -->
     <string name="sound_mode_mono">Mono</string>