tests/qbluetooth: Add test to attach serial devices via UART HCI

Attach to serial device connected to <port> using hciattach command.

Signed-off-by: Enric Balletbo i Serra <eballetbo@iseebcn.com>
helpers/omap: Helper function to enable bluetooth on IGEP0050.

Send a pulse to the BT_EN pin to enable the bluetooth.

Signed-off-by: Enric Balletbo i Serra <eballetbo@iseebcn.com>
suites/board_igep0050: Add test to check bluetooth interface.

The test attaches serial devices via UART HCI to BlueZ stack.

Signed-off-by: Enric Balletbo i Serra <eballetbo@iseebcn.com>