Merge "legacy: Update stack::gatt mocks" am: 18bc98f4

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/2056578



Change-Id: I6c4acd3b2291c9050610376ab3a54d8210ec4464
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>