meta-phosphor: prep for new override syntax

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I588025b614416c43aa2d053765ab53bacf890cb5
diff --git a/meta-phosphor/recipes-graphics/obmc-ikvm/obmc-ikvm_git.bb b/meta-phosphor/recipes-graphics/obmc-ikvm/obmc-ikvm_git.bb
index 9b427b7..05e0926 100644
--- a/meta-phosphor/recipes-graphics/obmc-ikvm/obmc-ikvm_git.bb
+++ b/meta-phosphor/recipes-graphics/obmc-ikvm/obmc-ikvm_git.bb
@@ -10,7 +10,7 @@
 
 PV = "1.0+git${SRCPV}"
 
-SYSTEMD_SERVICE_${PN} += "start-ipkvm.service"
+SYSTEMD_SERVICE:${PN} += "start-ipkvm.service"
 
 S = "${WORKDIR}/git"