Since sriov binding driver uses pod resource
service and compute particular virtual function
which was returned by pod resource service, there
is no need to have physycal_device_mapping.
Also this commit fixes documentation and
adds release note regarding physical_device_mapping removal.
Change-Id: Ibf793b78727da40283b6221c6df0da969bf5e829
Signed-off-by: Danil Golov <d.golov@samsung.com>