meta-ibm: update admin user home directory

currently admin user created with home directory '/' and there is an
error while deleting admin user.

this commit updates admin user home directory to /home/admin.

Tested by: Notice admin home directory and Delete admin user

Change-Id: I32210435ac0a94555d2f369e226df7e04f49d88c
Signed-off-by: Ravi Teja <raviteja28031990@gmail.com>
diff --git a/meta-ibm/recipes-phosphor/images/obmc-phosphor-image.bbappend b/meta-ibm/recipes-phosphor/images/obmc-phosphor-image.bbappend
index 92fa44a..a82f62c 100644
--- a/meta-ibm/recipes-phosphor/images/obmc-phosphor-image.bbappend
+++ b/meta-ibm/recipes-phosphor/images/obmc-phosphor-image.bbappend
@@ -52,7 +52,7 @@
 
 # Add the "admin" account.
 IBM_EXTRA_USERS_PARAMS += " \
-  useradd -M -d / --groups priv-admin,redfish,web -s /sbin/nologin admin; \
+  useradd --groups priv-admin,redfish,web -s /sbin/nologin admin; \
   usermod -p ${DEFAULT_OPENBMC_PASSWORD} admin; \
   "