Delete unused common.android.emailcommon package.

Bug: 139497239
Test: make BluetoothInstrumentationTests and atest BluetoothInstrumentationTests
Change-Id: I7aa4ccf9ed1c295f14d4ff1ce6328562021fb611
diff --git a/tests/unit/Android.mk b/tests/unit/Android.mk
index 98c88d4..0ba6f37 100644
--- a/tests/unit/Android.mk
+++ b/tests/unit/Android.mk
@@ -14,7 +14,6 @@
     android.test.mock
 
 LOCAL_STATIC_JAVA_LIBRARIES :=  \
-    com.android.emailcommon \
     androidx.test.rules \
     mockito-target \
     androidx.test.espresso.intents