kni: fix build dependency

kni: fix build dependency

kni library has a dependency to new PCI library, adding that dependency.

build error:
  CC rte_kni.o
In file included from dpdk/lib/librte_kni/rte_kni.c:48:0:
  dpdk/build/include/rte_kni.h:49:21:
  fatal error: rte_pci.h: No such file or directory
    #include <rte_pci.h>
                       ^

Fixes: c752998b5e2e ("pci: introduce library and driver")
Cc: stable@dpdk.org
Reported-by: Bernard Iremonger <bernard.iremonger@intel.com>
Signed-off-by: Ferruh Yigit <ferruh.yigit@intel.com>
Acked-by: Bernard Iremonger <bernard.iremonger@intel.com>