legacy: Remove unused typedefs hci/include/hci_layer am: 0916ed72 am:...

legacy: Remove unused typedefs hci/include/hci_layer am: 0916ed72 am: 3d9abf3b am: 6bd91818 am: 4c320410

Original change: https://android-review.googlesource.com/c/platform/system/bt/+/1820874

Change-Id: I270cb38676a48dbf61e0b9f6d8682b6c25723007