Include mockito extended explicitly

Currently mockito-target-extended-minus-junit4 is included transitively
through net-tests-utils. frameworks-base-testutils references it as a
"lib" but expects users of the library to include it themselves.

As the dependency is being removed from net-tests-utils, add it
explicitly here.

Test: atest
Bug: None
Change-Id: I1dd5254470e4dea85ea989497197d593c913f42f
1 file changed