dt-bindings: nvmem: SID: allow NVMEM cells based on old syntax

This binding supported NVMEM cells as subnodes and that syntax is used
by few in-kenel DTS files. Modify binding to allow it.
Reported-by: Rob Herring <robh@kernel.org>
Fixes: c5330723 ("dt-bindings: nvmem: move deprecated cells binding to its own file")
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20231024171253.19976-1-zajec5@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Documentation/devicetree/bindings/nvmem/allwinner,sun4i-a10-sid.yaml

@@ -12,6 +12,7 @@ maintainers:
 
 allOf:
   - $ref: nvmem.yaml#
+  - $ref: nvmem-deprecated-cells.yaml#
 
 properties:
   compatible: