hw/arm : Pass STM32L4x5 SYSCFG gpios to STM32L4x5 SoC

hw/arm : Pass STM32L4x5 SYSCFG gpios to STM32L4x5 SoC

Exposing SYSCFG inputs to the SoC is practical in order to wire the SoC
to the optional DM163 display from the board code (GPIOs outputs need
to be connected to both SYSCFG inputs and DM163 inputs).

STM32L4x5 SYSCFG in-irq interception needed to be changed accordingly.

Signed-off-by: Arnaud Minier <arnaud.minier@telecom-paris.fr>
Signed-off-by: Inès Varhol <ines.varhol@telecom-paris.fr>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-id: 20240424200929.240921-3-ines.varhol@telecom-paris.fr
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>