TestNetworkService: Fix TestNetworkInterface parcel flags

PARCELABLE_WRITE_RETURN_VALUE will close the fd when writeParcelable is
called. This is not always preferable (specifically, if
TestNetworkInterface is passed as an "in" parameter).
writeParcelable(FileDescriptor, ...) should therefore use the flags
passed to writeToParcel which should be correct for all cases.

Test: atest EthernetManagerTest
Change-Id: Ibb5f14028a3d686157504da3657a18ec0bc28110
1 file changed