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

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



Change-Id: Ic7d0f567bd761e03752918b9a52ef28f62440db3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>