[dts] [PATCH V2] tests/TestSuite_cvl_dcf_switch_filter.py: Modify max_vfs case to adapt to different CVL NICs

[Tu, Lijuan]

> Modify max_vfs test case to make the case adapt to different CVL NICs with
> different number of ports.
> 
> Signed-off-by: Nannan Lu <nannan.lu at intel.com>
> ---
>  tests/TestSuite_cvl_dcf_switch_filter.py | 31 +++++++++++++++++++++----------

Applied