dt-bindings: mt76: support pointing to EEPROM using NVMEM cell

All kind of calibration data should be described as NVMEM cells of NVMEM
devices. That is more generic solution than "mediatek,mtd-eeprom" which
is MTD specific.

Add support for EEPROM NVMEM cells and deprecate existing MTD-based
property.

Cc: Christian Marangi <ansuelsmth@gmail.com>
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

Documentation/devicetree/bindings/net/wireless/mediatek,mt76.yaml

@@ -72,6 +72,14 @@ properties:
 
   ieee80211-freq-limit: true
 
+  nvmem-cells:
+    items:
+      - description: NVMEM cell with EEPROM
+
+  nvmem-cell-names:
+    items:
+      - const: eeprom
+
   mediatek,eeprom-data:
     $ref: /schemas/types.yaml#/definitions/uint32-array
     description:
@@ -85,6 +93,7 @@ properties:
           - description: offset containing EEPROM data
     description:
       Phandle to a MTD partition + offset containing EEPROM data
+    deprecated: true
 
   big-endian:
     $ref: /schemas/types.yaml#/definitions/flag
@@ -259,7 +268,8 @@ examples:
       interrupt-parent = <&cpuintc>;
       interrupts = <6>;
 
-      mediatek,mtd-eeprom = <&factory 0x0>;
+      nvmem-cells = <&eeprom>;
+      nvmem-cell-names = "eeprom";
     };
 
   - |