wfd : Adding permission for mediacodec

      -- Adding read, getattr, and open
         permission for proc_net file.
      -- Allow fd exchange from mediacodec to
         wfdservice
      -- Allow wfdservice to make binder call
         into mediacodec
      -- Allow wfdservice to query interface
         name of network

CRs-Fixed: 1039623
Change-Id: I6174a30538995758c685190a3f280c417780bc47