ARM: dts: aspeed: Specify required properties for sram node

ARM: dts: aspeed: Specify required properties for sram node

Squash warnings such as:

```
arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-galaxy100.dtb: sram@1e720000: '#address-cells' is a required property
        from schema $id: http://devicetree.org/schemas/sram/sram.yaml#
arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-galaxy100.dtb: sram@1e720000: '#size-cells' is a required property
        from schema $id: http://devicetree.org/schemas/sram/sram.yaml#
arch/arm/boot/dts/aspeed/aspeed-bmc-facebook-galaxy100.dtb: sram@1e720000: 'ranges' is a required property
        from schema $id: http://devicetree.org/schemas/sram/sram.yaml#
```

Fixes: d44a1138cd82 ("arm/dts: Add Aspeed ast2400 device tree")
Link: https://lore.kernel.org/r/20240802-dt-warnings-bmc-dts-cleanups-v1-3-1cb1378e5fcd@codeconstruct.com.au
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>
Signed-off-by: Joel Stanley <joel@jms.id.au>