bt_hci_bdroid: check for failure to open hci

Initialization should not continue if we failed to open the hci transport.

Change-Id: Idf2008477f34ed216163ca47be637f415d640bf5
Signed-off-by: Matt Gumbel <matthew.k.gumbel@intel.com>
Support USB HCI

Issue: AXIA-1459
Change-Id: Ie4cc5766446774a0bae3bbf7d9baa5f44e814f59
Signed-off-by: Ravindranath Doddi <ravindranathx.doddi@intel.com>
Signed-off-by: Krishnan V <krishnanx.vaidyanathan.venkitakrishnan@intel.com>
Signed-off-by: Daniel Leung <daniel.leung@intel.com>
Signed-off-by: Matt Gumbel <matthew.k.gumbel@intel.com>