device: Fix bearer selection with single mode controller

device: Fix bearer selection with single mode controller

If remote device is dual mode and advertises without "BR/EDR flag
not supported" set than device is marked as supporting BR/EDR
even if controller is doing LE only. This results in bluetoothd
trying to connect over BR/EDR since this is prefered transport
if none is connected.

Fix this by checking if adapter supports specified technology
before doing heuristic transport selection.

Change-Id: Icb51c40a4327759817c637f90821c0bea866edc4
Signed-off-by: Amit Purwar <amit.purwar@samsung.com>