tests/qtest: Introduce tests for Xilinx VERSAL CANFD controller

tests/qtest: Introduce tests for Xilinx VERSAL CANFD controller

The QTests perform three tests on the Xilinx VERSAL CANFD controller:
    Tests the CANFD controllers in loopback.
    Tests the CANFD controllers in normal mode with CAN frame.
    Tests the CANFD controllers in normal mode with CANFD frame.

Signed-off-by: Vikram Garhwal <vikram.garhwal@amd.com>
Acked-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Francisco Iglesias <francisco.iglesias@amd.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>