dt-bindings: spi: amlogic,a1-spifc: add missing power-domains

On the Amlogic A1, the SPI FC controller can require a power-domain to
operate, add it as optional.
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://msgid.link/r/20240605-topic-amlogic-upstream-bindings-fixes-power-domains-spifc-v1-1-380f29ba4a16@linaro.orgSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/spi/amlogic,a1-spifc.yaml

@@ -23,6 +23,9 @@ properties:
   clocks:
     maxItems: 1
 
+  power-domains:
+    maxItems: 1
+
 required:
   - compatible
   - reg