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: Ic4ce27e7be1d23778a8d8a445ad7fc18c4d5f6e0
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>