dt-bindings: spi: add Amlogic A1 SPI controller

Add YAML devicetree Amlogic A1 (A113L SoC) SPIFC.
Signed-off-by: Martin Kurbanov <mmkurbanov@sberdevices.ru>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20230403183217.13280-2-mmkurbanov@sberdevices.ruSigned-off-by: Mark Brown <broonie@kernel.org>

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

+# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/spi/amlogic,a1-spifc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Amlogic A1 SPI Flash Controller
+
+maintainers:
+  - Martin Kurbanov <mmkurbanov@sberdevices.ru>
+
+allOf:
+  - $ref: spi-controller.yaml#
+
+properties:
+  compatible:
+    enum:
+      - amlogic,a1-spifc
+
+  reg:
+    maxItems: 1
+
+  clocks:
+    maxItems: 1
+
+required:
+  - compatible
+  - reg
+  - clocks
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    spi@fd000400 {
+        compatible = "amlogic,a1-spifc";
+        reg = <0xfd000400 0x290>;
+        clocks = <&clkc_clkid_spifc>;
+        #address-cells = <1>;
+        #size-cells = <0>;
+    };