drivers: add stm32 EXTI support

The stm32 EXTI peripheral is an interrupt controller that routes
the incoming interrupts to the GIC parent interrupt controller.
The EXTI can trigger the wake-up of t

drivers: add stm32 EXTI support

The stm32 EXTI peripheral is an interrupt controller that routes
the incoming interrupts to the GIC parent interrupt controller.
The EXTI can trigger the wake-up of the system on the incoming
interrupts.

Signed-off-by: Antonio Borneo <antonio.borneo@foss.st.com>
Reviewed-by: Etienne Carriere <etienne.carriere@foss.st.com>

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