pwm: stm32: add support for stm32mp25

pwm: stm32: add support for stm32mp25

Add support for STM32MP25 SoC. Use newly introduced compatible to handle
new features along with registers and bits diversity.
The MFD part of the driver fills in ipidr, so it is used to check the
hardware configuration register, when available to gather the number
of PWM channels and complementary outputs.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Link: https://lore.kernel.org/r/20250110091922.980627-5-fabrice.gasnier@foss.st.com
Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>