dt-bindings: eeprom: at24: 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: c533072 ("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>
Acked-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Link: https://lore.kernel.org/r/20231024171253.19976-2-zajec5@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: Rafał Miłecki

Documentation/devicetree/bindings/eeprom/at24.yaml

@@ -12,6 +12,7 @@ maintainers:
 
 allOf:
   - $ref: /schemas/nvmem/nvmem.yaml
+  - $ref: /schemas/nvmem/nvmem-deprecated-cells.yaml
 
 select:
   properties: