arm64: dts: microchip: sparx5: Fix CPU node "enable-method" property dependencies
The "spin-table" enable-method requires "cpu-release-addr" property,
so add a dummy entry. It is assumed the bootloader will fill in the
correct values.
Signed-off-by: Rob Herring (Arm) <robh@kernel.org> Reviewed-by: Daniel Machon <daniel.machon@microchip.com> Tested-by: Daniel Machon <daniel.machon@microchip.com> Signed-off-by: Conor Dooley <conor.dooley@microchip.com>