bt: Fix HCI driver selection logic for Qualcomm Bluetooth

bt: Fix HCI driver selection logic for Qualcomm Bluetooth

* Previously BT_SOC_SMD was the same as BT_SOC_DEFAULT, which
  is no longer true.
* The iteration to determine SOC type only worked due to the specific
  values of BT_SOC_DEFAULT and BT_SOC_SMD previously. Fix the iteration
  to actually check all SOC types.

Change-Id: If282200737099d6587f3dc6fcd0a7e70b93996cb