meta-phosphor: prep for new override syntax

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I588025b614416c43aa2d053765ab53bacf890cb5
diff --git a/meta-phosphor/recipes-phosphor/packagegroups/packagegroup-obmc-phosphor-debugtools.bb b/meta-phosphor/recipes-phosphor/packagegroups/packagegroup-obmc-phosphor-debugtools.bb
index 6890493..edcc9ff 100644
--- a/meta-phosphor/recipes-phosphor/packagegroups/packagegroup-obmc-phosphor-debugtools.bb
+++ b/meta-phosphor/recipes-phosphor/packagegroups/packagegroup-obmc-phosphor-debugtools.bb
@@ -3,7 +3,7 @@
 
 inherit packagegroup
 
-RDEPENDS_${PN} = " \
+RDEPENDS:${PN} = " \
     strace \
     ldd \
     ethtool \