Mocking AdbManagerInternal for UsbHandlerTest

Mocking AdbManagerInternal for unit test cases of UsbHandlerTest.
Removing test case bootCompletedAdbEnabled as it was not performing the
expected test.

Bug: 268393886
Test: atest UsbTests
Change-Id: I684bf5feb06ee647fc838ee71e8530fe18642417
2 files changed