Merge "legacy: Comment rfcomm frame types" am: 099bd1e4 am: a91074f2

Original change: https://android-review.googlesource.com/c/platform/packages/modules/Bluetooth/+/2040951



Change-Id: I7d7cdc2f4d82955b9a4d89da60b92f29ab3b0893
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>