dt-bindings: usb: richtek,rt1711h: Switch ETEK ET7304 to use a fallback compatible

As stated in [1], ETEK ET7304 is identical to Richtek RT1715, except for
the VID value in its registers, so reflect it in the bindings via a
fallback compatible.

As there are various TCPCI chips by different vendors reimplementing the
registers and behavior of the RT1711H/RT1715, fallback compatibles will
scale better.

Link: https://lore.kernel.org/all/20260220-et7304-v3-2-ede2d9634957@gmail.com/ [1]
Signed-off-by: Alexey Charkov <alchark@flipper.net>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://patch.msgid.link/20260318-husb311-v4-2-69e029255430@flipper.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/usb/richtek,rt1711h.yaml

@@ -18,10 +18,14 @@ description: |
 
 properties:
   compatible:
-    enum:
-      - etekmicro,et7304
-      - richtek,rt1711h
-      - richtek,rt1715
+    oneOf:
+      - enum:
+          - richtek,rt1711h
+          - richtek,rt1715
+      - items:
+          - enum:
+              - etekmicro,et7304
+          - const: richtek,rt1715
     description:
       RT1711H support PD20, ET7304 and RT1715 support PD30 except Fast Role Swap.