drop latencytop

latencytop was dropped upstream.  Reference oe-core commit
36aae56e7f86a4d5ce93e4528e7dcc42f60c705e.

Change-Id: I90c11193476ab1e1bb8d71893445a87e45a0bd89
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/common/recipes-phosphor/packagegroups/packagegroup-obmc-phosphor-debugtools.bb b/common/recipes-phosphor/packagegroups/packagegroup-obmc-phosphor-debugtools.bb
index 9ca709d..1a6d4b7 100644
--- a/common/recipes-phosphor/packagegroups/packagegroup-obmc-phosphor-debugtools.bb
+++ b/common/recipes-phosphor/packagegroups/packagegroup-obmc-phosphor-debugtools.bb
@@ -12,5 +12,4 @@
     phosphor-logging-test \
     lmsensors-sensors \
     tcpdump \
-    latencytop \
     "