dt-bindings: mmc: sdhci-msm: correct minimum number of clocks

In the TXT binding before conversion, the "xo" clock was listed as
optional.  Conversion kept it optional in "clock-names", but not in
"clocks".  This fixes dbts_check warnings like:

  qcom-sdx65-mtp.dtb: mmc@8804000: clocks: [[13, 59], [13, 58]] is too short

Cc: <[email protected]>
Fixes: a455377 ("dt-bindings: mmc: sdhci-msm: Convert bindings to yaml")
Signed-off-by: Krzysztof Kozlowski <[email protected]>
Acked-by: Conor Dooley <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Ulf Hansson <[email protected]>

Author: krzk

Documentation/devicetree/bindings/mmc/sdhci-msm.yaml

@@ -69,7 +69,7 @@ properties:
     maxItems: 4
 
   clocks:
-    minItems: 3
+    minItems: 2
     items:
       - description: Main peripheral bus clock, PCLK/HCLK - AHB Bus clock
       - description: SDC MMC clock, MCLK