Makefile: Fix DPDK build target

DPDK build should be split into a config step and an
install step.

This patch also fixes the patch step which would fail if
the patch was not already applied before trying to revert
it.

Reviewed-by: Meghan Halton <meghan.halton@intel.com>
Signed-off-by: Mark D. Gray <mark.d.gray@intel.com>
Merge "Makefile: Fix DPDK build target" into development