p2p: avoid adding duplicate channel lists am: 8183656c61

Original change: https://googleplex-android-review.googlesource.com/c/platform/external/wpa_supplicant_8/+/19272886

Change-Id: I95a5e42f9d5a267dc1cd67f48b4886ff8c3e6e6e
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>