irqchip/stm32mp-exti: Rename internal symbols

Rename all the internal symbols accordingly to the new name of the
driver.

Renaming done automatically through sed rules:
	s/stm32_exti_set_type/stm32mp_exti_convert_type/g
	s/stm32_exti_h_/stm32mp_exti_/g
	s/stm32_exti/stm32mp_exti/g
	s/stm32_bank/bank/g
	s/stm32_/stm32mp_/g
	s/STM32_/STM32MP_/g
	s/STM32MP1_/STM32MP_/g
	s/stm32mp1_exti_/stm32mp_exti_/g
	s/stm32-exti-h/stm32mp-exti/g

Manually fix some indentation after the rename.

[ tglx: Mop up more coding style issues while at it ]
Signed-off-by: Antonio Borneo <antonio.borneo@foss.st.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240620083115.204362-6-antonio.borneo@foss.st.com