spi: stm32: disable spi-slave property for stm32f4-f7

STM32F4 and STM32F7 can't switch to spi device mode.
Forbid this property with compatible "st,stm32f4-spi".

Signed-off-by: Alain Volmat <[email protected]>
Signed-off-by: Valentin Caron <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Mark Brown <[email protected]>

Author: Alain Volmat

Documentation/devicetree/bindings/spi/st,stm32-spi.yaml

@@ -27,6 +27,7 @@ allOf:
     then:
       properties:
         st,spi-midi-ns: false
+        spi-slave: false
 
 properties:
   compatible: