[TOFU] Validate full cert chains before displaying dialog am: b0ee00ddf3

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Wifi/+/22772854

Change-Id: Ib7c2e0baaf8343952510459d28ad7035c283fc98
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>