Update the Fast Pair account key index to 9.

This follows the current spec and be consistent wih the NanoApp side.

Bug: 225486915
Test: atest NearbyUnitTests and end-to-end device tests
Ignore-AOSP-First: nearby_not_in_aosp_yet

Change-Id: I1d28c663af078fc993fb96f1fc5c7ec147e07e86
2 files changed