Remove legacy BroadcastQueue implementation.

Bug: 266001401
Test: atest services/tests/mockingservicestests/src/com/android/server/am/BroadcastQueueTest.java
Test: atest services/tests/mockingservicestests/src/com/android/server/am/BroadcastQueueModernImplTest.java
Change-Id: Ifdcbddf71bc05b7c991c74e6e3319b8eb3132ffa
9 files changed