meta-facebook: add tcpdump to all images

Networking team asked for tcpdump to be added to facilitate debug
operations. Add it to the set of debug-utilities we include by
default.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Ie864fc23f8c22db33b41518a923185f4c737b99c
diff --git a/meta-facebook/recipes-phosphor/images/fb-phosphor-image.inc b/meta-facebook/recipes-phosphor/images/fb-phosphor-image.inc
index d15ea10..84e4e40 100644
--- a/meta-facebook/recipes-phosphor/images/fb-phosphor-image.inc
+++ b/meta-facebook/recipes-phosphor/images/fb-phosphor-image.inc
@@ -19,6 +19,7 @@
     jq \
     strace \
     tmux \
+    tcpdump \
     wget \
     "
 OBMC_IMAGE_EXTRA_INSTALL:append:mf-fb-secondary-emmc = " \