Include NotificationEntryBuilder dependencies in SystemUI-tests-utils

ag/10722011 introduced FakeSystemClock as a dependency to
NotificationEntrytBuilder, so FakeSystemClock and its dependency
FakeExecutor should be included in SystemUI-tests-utils.

Bug: 153680380
Test: atest ArcSystemUITests
Change-Id: Iad7add9021ba374c138bdc266af7b2608e8a03dd