Make hidl.manager optional in default device matrix am: 32121aecfd am: 360773b366

Original change: https://android-review.googlesource.com/c/platform/system/libhidl/+/2243537

Change-Id: I44d771c26d9722a9bca1c7b4c489f90bced5869c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>