stack::rfcomm::api Variable rename port_handle => handle am: 9870abe7 am: 5a3ccc51

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/3106764



Change-Id: I005926965189070800b983b13db442c65693b8a2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>