releng: add nebula dependencies on incubator update site

Update category.xml for that. Without this the incubator kernel add-on
won't install.

Change-Id: I1b01b634392d1a569f5f5e788f3974882c125aab
Signed-off-by: Bernd Hufmann <Bernd.Hufmann@ericsson.com>
Reviewed-on: https://git.eclipse.org/r/c/tracecompass.incubator/org.eclipse.tracecompass.incubator/+/173570
Tested-by: Patrick Tasse <patrick.tasse@gmail.com>
Tested-by: Trace Compass Bot <tracecompass-bot@eclipse.org>
Reviewed-by: Patrick Tasse <patrick.tasse@gmail.com>
(cherry picked from commit ec4adf9e9fdb99a8c8b22af792cf057612c1491c)
Reviewed-on: https://git.eclipse.org/r/c/tracecompass.incubator/org.eclipse.tracecompass.incubator/+/173132
Tested-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
Reviewed-by: Bernd Hufmann <bernd.hufmann@ericsson.com>
diff --git a/common/org.eclipse.tracecompass.incubator.releng-site/category.xml b/common/org.eclipse.tracecompass.incubator.releng-site/category.xml
index 0e1fe6b..3e44cbc 100644
--- a/common/org.eclipse.tracecompass.incubator.releng-site/category.xml
+++ b/common/org.eclipse.tracecompass.incubator.releng-site/category.xml
@@ -73,6 +73,8 @@
    <bundle id="com.google.javascript"/>
    <bundle id="com.google.protobuf"/>
    <bundle id="org.eclipse.wst.jsdt.manipulation"/>
+   <bundle id="org.eclipse.nebula.widgets.opal.commons"/>
+   <bundle id="org.eclipse.nebula.widgets.opal.duallist"/>
    <category-def name="trace-types" label="Trace Types"/>
    <category-def name="virtualization" label="Virtualization"/>
    <category-def name="analyses" label="Analyses"/>