dt-bindings: atmel-sysreg: add sam9x7

Add RAM controller & PIT64 DT bindings.
Signed-off-by: Varshini Rajendran <varshini.rajendran@microchip.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20240729070543.1990209-1-varshini.rajendran@microchip.comSigned-off-by: Claudiu Beznea <claudiu.beznea@tuxon.dev>

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

@@ -11,7 +11,8 @@ PIT Timer required properties:
   shared across all System Controller members.
 
 PIT64B Timer required properties:
-- compatible: Should be "microchip,sam9x60-pit64b"
+- compatible: Should be "microchip,sam9x60-pit64b" or
+			"microchip,sam9x7-pit64b", "microchip,sam9x60-pit64b"
 - reg: Should contain registers location and length
 - interrupts: Should contain interrupt for PIT64B timer
 - clocks: Should contain the available clock sources for PIT64B timer.
@@ -31,7 +32,8 @@ RAMC SDRAM/DDR Controller required properties:
 			"atmel,at91sam9g45-ddramc",
 			"atmel,sama5d3-ddramc",
 			"microchip,sam9x60-ddramc",
-			"microchip,sama7g5-uddrc"
+			"microchip,sama7g5-uddrc",
+			"microchip,sam9x7-ddramc", "atmel,sama5d3-ddramc".
 - reg: Should contain registers location and length
 
 Examples: