Add validation on attr type and size in a2dp_api.cc am: c5bc4c49 am: c750219d

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/24638582



Change-Id: I0acfd9350c53be129aa319541af4b2da6da92c66
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>