dpdk: Add build related keywords for failsafe PMD

Added build related keywords for TAP, FAILSAFE PMD
and also added some missing keywords for mlx4 PMD

This is part of initial effort to enable vpp running over
dpdk on failsafe PMD in Microsoft Azure (1/4).

Change-Id: I2aebf209fbc6db030185f41971b51a593a003a3a
Signed-off-by: Rui Cai <rucai@microsoft.com>
diff --git a/build-data/packages/dpdk.mk b/build-data/packages/dpdk.mk
index 92eb631..ab2e39a 100644
--- a/build-data/packages/dpdk.mk
+++ b/build-data/packages/dpdk.mk
@@ -27,6 +27,11 @@
 DPDK_MAKE_ARGS += DPDK_MLX5_PMD=y
 endif
 
+DPDK_MLX4_PMD=$(strip $($(PLATFORM)_uses_dpdk_mlx4_pmd))
+ifneq ($(DPDK_MLX4_PMD),)
+DPDK_MAKE_ARGS += DPDK_MLX4_PMD=y
+endif
+
 DPDK_PLATFORM_TARGET=$(strip $($(PLATFORM)_dpdk_target))
 ifneq ($(DPDK_PLATFORM_TARGET),)
 DPDK_MAKE_ARGS += DPDK_TARGET=$(DPDK_PLATFORM_TARGET)