meta-google: rng-tools: Add package suffix

Due to the rng-tools systemd/sysvinit service being split into a package
during the subtree update, adding the corresponding suffix to resolve
the compile error.

Change-Id: I66930d75d081fc84e33ccdcff4d32ee2d3d36326
Signed-off-by: David Wang <davidwang@quantatw.com>
diff --git a/meta-google/recipes-support/rng-tools/rng-tools_%.bbappend b/meta-google/recipes-support/rng-tools/rng-tools_%.bbappend
index abf0113..4c9aa3f 100644
--- a/meta-google/recipes-support/rng-tools/rng-tools_%.bbappend
+++ b/meta-google/recipes-support/rng-tools/rng-tools_%.bbappend
@@ -2,7 +2,7 @@
 
 SRC_URI:append:gbmc = " file://default"
 
-SYSTEMD_SERVICE:${PN}:append:gbmc = " rng-tools-nojitter.service"
+SYSTEMD_SERVICE:${PN}-service:append:gbmc = " rng-tools-nojitter.service"
 
 do_install:append:gbmc() {
   install -m 0644 ${D}${systemd_system_unitdir}/rng-tools.service \