dt-bindings: clocks: atmel,at91sam9x5-sckc: add sama7d65

Add bindings for SAMA7D65's slow clock controller.

Signed-off-by: Dharma Balasubiramani <[e-mail]>
Signed-off-by: Ryan Wanner <[e-mail]>
Acked-by: Conor Dooley <[e-mail]>
Reviewed-by: Claudiu Beznea <[e-mail]>
Link: https://lore.kernel.org/r/b7a[e-mail]
Signed-off-by: Claudiu Beznea <[e-mail]>

Documentation/devicetree/bindings/clock/atmel,at91sam9x5-sckc.yaml

···
       - items:
           - enum:
               - microchip,sam9x7-sckc
+              - microchip,sama7d65-sckc
               - microchip,sama7g5-sckc
           - const: microchip,sam9x60-sckc