update grain name for ceph OSDs

Related-Prod: PROD-35230
Change-Id: Idbd3114d0d6e1d802a2a925dbc5a83136fd2a5f4
diff --git a/cloud-update.groovy b/cloud-update.groovy
index f45e4ec..b76c4b2 100644
--- a/cloud-update.groovy
+++ b/cloud-update.groovy
@@ -897,7 +897,7 @@
     def salt = new com.mirantis.mk.Salt()
     def common = new com.mirantis.mk.Common()
     def targetHosts = salt.getMinionsSorted(pepperEnv, target)
-    def device_grain_name =  salt.getPillar(pepperEnv,"I@ceph:osd","ceph:osd:lvm_enabled")['return'].first().containsValue(true) ? "ceph_volume" : "ceph_disk"
+    def device_grain_name =  "ceph_disk"
     for (t in targetHosts) {
         def osd_ids = []
         // get list of osd disks of the host