ARM: dts: stm32: List exti parent interrupts on stm32mp131

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

By switching away from using the internal table, there is no need anymore
to use the specific compatible "st,stm32mp13-exti", which was introduced to
select the proper internal table.

Convert the driver's table for stm32mp131 to the DT property
interrupts-extended.

Switch the compatible string to the generic "st,stm32mp1-exti", in place of
the specific "st,stm32mp13-exti".

Older DT using compatible "st,stm32mp13-exti" will still work as the driver
remains backward compatible.

Signed-off-by: Antonio Borneo <antonio.borneo@foss.st.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240415134926.1254428-10-antonio.borneo@foss.st.com