Remove location-permission check from VcnStatusCallbacks.

This CL updates VcnManagementService to not require location permissions
for receiving VcnStatusCallback invocations. This change is safe to make
because these callbacks are not capable of leaking any location-related
information.

Bug: 180556279
Test: atest FrameworksVcnTests CtsVcnTestCases
Change-Id: I38600aeb2489f139b3479b07de77facc2ae838c5