[nearby] Update encryption methods according to the spec am: f31eccbdbb am: fe140c83c9

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Connectivity/+/2866369

Change-Id: I272daa22662e0d8242a42b4e21085b67cd14d961
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>