[dts] [PATCH v3] tests/ip_pipeline: fix test failures

[Liu, Yong]

Thanks Jianbo. Applied in master branch.

On 09/12/2017 11:31 AM, Jianbo Liu wrote:
> The ip_pipeline was changed a lot, and the configuration and commands
> are different from those in this testing case.
>
> v2:
>    - the sink0 id is 2.
>
> v3:
>    - add more comments for cfg file creations.
>    - remove temporary files with force in case they don't exist.
>
> Signed-off-by: Jianbo Liu<jianbo.liu at linaro.org>
> ---