meta-romulus: Add webui recipe

This enables webui hosted by Romulus machine.

Tested: WebUI works fine on Romulus.

Change-Id: I29cefdb07892717d3bb2397647a5e2dbf701dc8e
Signed-off-by: Lei YU <mine260309@gmail.com>
diff --git a/meta-romulus/recipes-phosphor/packagegroups/packagegroup-obmc-apps.bbappend b/meta-romulus/recipes-phosphor/packagegroups/packagegroup-obmc-apps.bbappend
index 55f036c..96e26b2 100644
--- a/meta-romulus/recipes-phosphor/packagegroups/packagegroup-obmc-apps.bbappend
+++ b/meta-romulus/recipes-phosphor/packagegroups/packagegroup-obmc-apps.bbappend
@@ -1 +1,2 @@
 RDEPENDS_${PN}-inventory += " openpower-occ-control phosphor-cooling-type id-button"
+RDEPENDS_${PN}-extras += "phosphor-webui"