tests/qtest : Add testcase for DM163

`test_dm163_bank()`
Checks that the pin "sout" of the DM163 led driver outputs the values
received on pin "sin" with the expected latency (depending on the bank)

tests/qtest : Add testcase for DM163

`test_dm163_bank()`
Checks that the pin "sout" of the DM163 led driver outputs the values
received on pin "sin" with the expected latency (depending on the bank).

`test_dm163_gpio_connection()`
Check that changes to relevant STM32L4x5 GPIO pins are propagated to the
DM163 device.

Signed-off-by: Arnaud Minier <arnaud.minier@telecom-paris.fr>
Signed-off-by: Inès Varhol <ines.varhol@telecom-paris.fr>
Acked-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20240424200929.240921-6-ines.varhol@telecom-paris.fr
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

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