Fix DPDK check in udp.h
Fix DPDK check in udp.h

Change-Id: I4734b248f512e223703d234d28542257af1a8074
Signed-off-by: Florin Coras <c9715e5cdf0718c2e9b10678757dfb027875eba2@cisco.com>

FDio/vpp,vpp-dev/vpp,chrisy/vpp,FDio/vpp,chrisy/vpp,GabrielGanne/vpp-flowtable,FDio/vpp,muharif/vpp,milanlenco/vpp,vpp-dev/vpp,chrisy/vpp,chrisy/vpp,milanlenco/vpp,muharif/vpp,milanlenco/vpp,milanlenco/vpp,GabrielGanne/vpp-flowtable,GabrielGanne/vpp-flowtable,muharif/vpp,chrisy/vpp,muharif/vpp,FDio/vpp,vpp-dev/vpp,GabrielGanne/vpp-flowtable,chrisy/vpp,GabrielGanne/vpp-flowtable,FDio/vpp,GabrielGanne/vpp-flowtable,FDio/vpp,FDio/vpp,milanlenco/vpp,chrisy/vpp,muharif/vpp,muharif/vpp,milanlenco/vpp,FDio/vpp,chrisy/vpp,vpp-dev/vpp,vpp-dev/vpp,vpp-dev/vpp,vpp-dev/vpp