LL: Handling Protocol Collision

[TorstenRobitzki]

Currently, there is no collision detection implemented.

• LL/CON/PER/BV-48-C
• LL/CON/PER/BV-46-C
• LL/CON/PER/BV-47-C

[TorstenRobitzki]

What is actually missing, is a reporting of the received LL_REJECT_EXT_IND, that could be handed to an HCI layer.