Fix the function that is responsible for deleting bmc ubi volumes

- The current script was checking for ubi4:rofs-<versionId>
  inside /proc/mount but it is listed as /media/rofs-<versionId>.
  Therefore the service files that removes the ubi volumes were
  failing.

Change-Id: Ie715e4b82d1e9c15708318cae367636d26642af3
Signed-off-by: Saqib Khan <khansa@us.ibm.com>
diff --git a/common/recipes-phosphor/flash/phosphor-software-manager/obmc-flash-bmc b/common/recipes-phosphor/flash/phosphor-software-manager/obmc-flash-bmc
index 4c32ab4..60e976b 100644
--- a/common/recipes-phosphor/flash/phosphor-software-manager/obmc-flash-bmc
+++ b/common/recipes-phosphor/flash/phosphor-software-manager/obmc-flash-bmc
@@ -161,8 +161,8 @@
     if [ ! -z "$vol" ]; then
         vol="${vol%_*}"
 
-        if grep -q "${vol}:$rmname" /proc/mounts; then
-            mountdir=$(grep "${vol}:$rmname" /proc/mounts | cut -d " " -f 2)
+        if grep -q "$rmname" /proc/mounts; then
+            mountdir=$(grep "$rmname" /proc/mounts | cut -d " " -f 2)
             umount "$mountdir"
             rm -r "$mountdir"
         fi