dt-bindings: spmi: remove the constraint of reg property

'reg' is controller specific so we shouldn't even be specifying it here.
Just remove it.

Link: https://lore.kernel.org/r/20211119034613.32489-2-james.lo@mediatek.comReviewed-by: Rob Herring <robh@kernel.org>
Signed-off-by: James Lo <james.lo@mediatek.com>
Signed-off-by: Hsin-Hsiung Wang <hsin-hsiung.wang@mediatek.com>
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20211216190812.1574801-3-sboyd@kernel.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/spmi/spmi.yaml

@@ -24,9 +24,6 @@ properties:
   $nodename:
     pattern: "^spmi@.*"
 
-  reg:
-    maxItems: 1
-
   "#address-cells":
     const: 2