spi: stm32: add st,stm32mp25-spi compatible supporting STM32MP25 soc

spi: stm32: add st,stm32mp25-spi compatible supporting STM32MP25 soc

Add support for the STM32MP25:
- Burst should not be enabled with the new DMA used on STM32MP25.
- STM32MP25 SPI8 has a limited feature set, it can only send words of
  8 or 16 bits and with a maximum words number of 1024.

Signed-off-by: Valentin Caron <valentin.caron@foss.st.com>
Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
Link: https://msgid.link/r/20231218155721.359198-4-alain.volmat@foss.st.com
Signed-off-by: Mark Brown <broonie@kernel.org>