stack::rfcomm::api Decl/init p_port when used am: 38f1bfb5

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/3106684



Change-Id: I2fb7415898312c009b86046791d292ea3b0b3af7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>