dt-bindings: fsi: Remove ibm,fsi2spi-restricted compatible

Remove this compatible string from the FSI SPI controller
documentation, since the security restrictions have been
universally applied to the controllers.

Signed-off-by: Eddie James <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Mark Brown <[e-mail]>

Documentation/devicetree/bindings/fsi/ibm,fsi2spi.yaml

···
   compatible:
     enum:
       - ibm,fsi2spi
-      - ibm,fsi2spi-restricted
 
   reg:
     items: