Bluetooth: tests/shell: Limit BR/EDR configuration to Qemu for now

The BR/EDR configuration doesn't fit e.g. the Arduino 101 anymore.
Limit it to Qemu for the time being, which is anyway the primary
target where the functionality is being tested.

Change-Id: I9a34c82157d56079e43acabe29eeadd6d99e03fe
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>