spi: add stm32f7-spi compatible

The STM32F7 SPI peripheral is nearly identical to the STM32F4, with the
only significant differences being support for a wider range of word
sizes and the addition of 32-bit transmit and receive FIFOs.
Signed-off-by: Ben Wolsieffer <ben.wolsieffer@hefring.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20231102193722.3042245-4-ben.wolsieffer@hefring.comSigned-off-by: Mark Brown <broonie@kernel.org>

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

@@ -23,6 +23,7 @@ properties:
   compatible:
     enum:
       - st,stm32f4-spi
+      - st,stm32f7-spi
       - st,stm32h7-spi
 
   reg: