dt-bindings: eeprom: at24: Add compatible for Belling BL24S64

Add the compatible for an 64Kb EEPROM from Belling.

Signed-off-by: Luca Weiss <[e-mail]>
Acked-by: Krzysztof Kozlowski <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Bartosz Golaszewski <[e-mail]>

Documentation/devicetree/bindings/eeprom/at24.yaml

···
           - const: atmel,24c32
       - items:
           - enum:
+              - belling,bl24s64
               - onnn,n24s64b
               - puya,p24c64f
           - const: atmel,24c64