dpdk: move submodule to commit 3fcb1dd

This adds recent commit:
  contigmem: cleanup properly when load fails

Fixes issue #1262.

Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: I4d873af280803c3cc6c146439a0bbc7af4c7296c

Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/1217


Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Aleksey Marchuk <alexeymar@mellanox.com>