PackageManager no longer requires the ExtServices to be a "Shared Library"

BUG: 147663325

Test: Boot
Test: atest cts/tests/tests/os/src/android/os/cts/RequiredComponentsTest.java
Test: mts-tradefed run mts-extservices

Change-Id: I32fcb27e54d50e362b3005dd6d235bcc30a60ac8