use device_type from SEC dev record when available

When deciding on transport to use for bonding device, BTM to
use device_type already stored in SEC dev record. This takes care of
the case when new device was just discovered and no inquire info or
identity resolving keys available to distinguish BLE from BR. But record
creation is already must be driven from transport specific flow and
must trust device_type in the record in this case.

Bug: 160645596
Bug: 199827901
Test: gd/cert/run
Tag: #compatibility
Change-Id: I9cfb912d8bcba6c5d02d5415aa1ee8f2dc6cb847
(cherry picked from commit 2e2dbf09694939ac9e014288a6b0085e5ac7e751)