Merge "Guard the usage of PacProxyManager when it is not supported by the device." am: 76f61bb2e8 am: 89c7b7db4e

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2623371

Change-Id: If09f3be68f63c610e4bb5e01ec9bc8e0fe735ea8
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>