Add FrameworksNetCommonTests to CTS

The common tests include tests that must be both in CTS and unit tests.

Bug: 129199908
Test: atest CtsNetTestCases, IpPrefixCommonTest is run and passes.
Change-Id: Id16f40247cca9a6c5bba573006b84547727f1bab
diff --git a/tests/cts/net/Android.mk b/tests/cts/net/Android.mk
index 2084dbc..0497470 100644
--- a/tests/cts/net/Android.mk
+++ b/tests/cts/net/Android.mk
@@ -39,6 +39,7 @@
 LOCAL_PACKAGE_NAME := CtsNetTestCases
 
 LOCAL_STATIC_JAVA_LIBRARIES := \
+    FrameworksNetCommonTests \
     core-tests-support \
     compatibility-device-util-axt \
     ctstestrunner-axt \