dt-bindings: pinctrl: spacemit: fix drive-strength check warning

The problem is that one value from drive-strength may match to more than
two different enum groups which lead to DT complaint, switch to use 'anyOf'
to fix this kind warning.

Fixes: c3efac0 ("dt-bindings: pinctrl: spacemit: convert drive strength to schema format")
Signed-off-by: Yixun Lan <dlan@kernel.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Reported-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Linus Walleij <linusw@kernel.org>

Author: Yixun Lan

Documentation/devicetree/bindings/pinctrl/spacemit,k1-pinctrl.yaml

@@ -80,7 +80,7 @@ patternProperties:
           drive-strength:
             description:
               typical current (in mA) when the output at high level.
-            oneOf:
+            anyOf:
               - enum: [ 11, 21, 32, 42 ]
                 description: For K1 SoC, 1.8V voltage output