[dts] [PATCH V2] tests/vhost_virtio_user_interrupt:add allow pci params when start testpmd and fix spelling mistakes

[Tu, Lijuan]

> v1:
> Add allow pci params when start testpmd.
> 
> v2:
> Fix spelling mistakes backed to backend.
> 
> Signed-off-by: Ling Wei <weix.ling at intel.com>

Applied.