dt-bindings: add eeprom "size" property

This adds eeprom "size" as optional property for i2c eeproms.
The "size" property allows explicitly specifying the size of the
EEPROM chip in bytes.
Acked-by: NRob Herring <robh@kernel.org>
Reviewed-by: NSakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: NDivagar Mohandass <divagar.mohandass@intel.com>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>

Documentation/devicetree/bindings/eeprom/eeprom.txt

@@ -36,6 +36,8 @@ Optional properties:
 
   - read-only: this parameterless property disables writes to the eeprom
 
+  - size: total eeprom size in bytes
+
 Example:
 
 eeprom@52 {