Migrate from the support library v4 to AndroidX

It is recommended to migrate to the AndroidX library as all the future
development will be done in it. Usage of LocalBroadcastManager should be
replaced with other implementation like the observable pattern in the
near future.

Bug: 128890104
Test: Confirmed the expected behavior in manual test cases.

Change-Id: Ia4f40c480b934fb69485ced324f5bbd80f0822f5
diff --git a/Android.bp b/Android.bp
index a2dbc03..cffb421 100644
--- a/Android.bp
+++ b/Android.bp
@@ -3,7 +3,7 @@
 android_app {
     name: "Stk",
     libs: ["telephony-common"],
-    static_libs: ["android-support-v4"],
+    static_libs: ["com.google.android.material_material"],
     srcs: ["**/*.java"],
     platform_apis: true,
     certificate: "platform",