dt-bindings: atmel-sysreg: Add SAMA7D65 Chip ID

Add compatible string for SAMA7D65 SoC ChipID dt-bindings.

Signed-off-by: Ryan Wanner <Ryan.Wanner@microchip.com>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://lore.kernel.org/r/008e4e49c9fd315cc96a185662b31eca1a64a614.1739555984.git.Ryan.Wanner@microchip.com
Signed-off-by: Claudiu Beznea <claudiu.beznea@tuxon.dev>

Author: ryan-wanner

Documentation/devicetree/bindings/arm/atmel-sysregs.txt

@@ -2,6 +2,7 @@ Atmel system registers
 
 Chipid required properties:
 - compatible: Should be "atmel,sama5d2-chipid" or "microchip,sama7g5-chipid"
+			"microchip,sama7d65-chipid"
 - reg : Should contain registers location and length
 
 PIT Timer required properties: