Fix DPDK build on arm

Fix DPDK build on arm

Directive #include <file> in GCC implementation searches for files
in a standard list of system directories, which leads to a build
error on Taishan arm machines:
/tmp/openvpp-testing/dpdk/lib/librte_ethdev/rte_ethdev.h:4287:10:
fatal error: rte_ethdev_core.h:
No such file or directory #include <rte_ethdev_core.h>

Fix this by replacing the directive with #include "file" which searches
for files first in the directory containing the current file and other
directories only after that.

Change-Id: If283b81c992c001a2f980312cdd99053c3d703d9
Signed-off-by: Juraj Linkeš <juraj.linkes@pantheon.tech>