dt-bindings: mmc: Add resets property to cadence SDHCI binding

Cadence SDHCI controller allows reset control support on UniPhier SoC.
Add resets property to cadence SDHCI binding.
Signed-off-by: Kunihiko Hayashi <hayashi.kunihiko@socionext.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20230213045233.32470-1-hayashi.kunihiko@socionext.comSigned-off-by: Ulf Hansson <ulf.hansson@linaro.org>

Documentation/devicetree/bindings/mmc/cdns,sdhci.yaml

@@ -29,6 +29,9 @@ properties:
   clocks:
     maxItems: 1
 
+  resets:
+    maxItems: 1
+
   # PHY DLL input delays:
   # They are used to delay the data valid window, and align the window to
   # sampling clock. The delay starts from 5ns (for delay parameter equal to 0)