Factor out duplicate code for parsing gap data am: 08690d66 am: cd546f8c

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/24638916



Change-Id: I639d4713e5153218671887d3a53758f20270dc8b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>