ebuild: Add MAKE_PARALLEL_FLAGS to VPP build
ebuild: Add MAKE_PARALLEL_FLAGS to VPP build

Align with other packages.

Type: make

Change-Id: I3c8f5c6a349ce9d4e05f546945ae2d8dcf3b1b61
Signed-off-by: juraj.linkes <cc98fdfd74a97bdc42df592c19d962e48c451a95@pantheon.tech>

vpp-dev/vpp,FDio/vpp,FDio/vpp,chrisy/vpp,chrisy/vpp,vpp-dev/vpp,vpp-dev/vpp,chrisy/vpp,vpp-dev/vpp,FDio/vpp,chrisy/vpp,FDio/vpp,FDio/vpp,FDio/vpp,vpp-dev/vpp,FDio/vpp,chrisy/vpp,vpp-dev/vpp,chrisy/vpp,chrisy/vpp,chrisy/vpp,vpp-dev/vpp,FDio/vpp