[dts] [PATCH] bugfix: Fixed a timeout with mlx5_core on ARM

[Tu, Lijuan]

> The time to unbind this driver has been increasing with DPDK releases, to the
> point that it is now about 14 seconds. This means that, with the default timeout
> of 15 seconds, there isn't much room for any kind of disruption during testing.
> DTS throwing a timeout error here is not indicative of an acutal problem, and as
> such I have increased the timeout to allow continued stable functioning. The
> new 30 second timeout should have minimal affect on the detection speed of
> any real error.
> 
> Signed-off-by: Owen Hilyard <ohilyard at iol.unh.edu>

Applied, thanks