ARM: dts: stm32: List exti parent interrupts on stm32mp151

Stop using the table inside the EXTI driver and list in DT the mapping
between EXTI events and its parent interrupts.

Convert the driver's table for stm32mp151 to the DT property
interrupts-extended.

Signed-off-by: Antonio Borneo <antonio.borneo@foss.st.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240415134926.1254428-9-antonio.borneo@foss.st.com