Added balloon device to x86_64 config
Added balloon device to x86_64 config

Signed-off-by: George Pisaltu <084beef259e7feee20f091a1c4e2b24ee6aa34bb@amazon.com>

firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker,firecracker-microvm/firecracker