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/sensors/phosphor-nvme_git.bb b/meta-phosphor/recipes-phosphor/sensors/phosphor-nvme_git.bb
index b09466f..62dd12c 100644
--- a/meta-phosphor/recipes-phosphor/sensors/phosphor-nvme_git.bb
+++ b/meta-phosphor/recipes-phosphor/sensors/phosphor-nvme_git.bb
@@ -18,4 +18,4 @@
 SRCREV = "31c3a2f7c993bb5e3fbeb9b624dbd135a204ef50"
 S = "${WORKDIR}/git"
 
-SYSTEMD_SERVICE_${PN} = "xyz.openbmc_project.nvme.manager.service"
+SYSTEMD_SERVICE:${PN} = "xyz.openbmc_project.nvme.manager.service"