samples: openthread: shell: prj-ot-host.conf file updated

Settings configuration is removed in the
zephyr/samples/net/openthread/shell/prj-ot-host.conf file.
No more used.

Signed-off-by: Xavier Razavet <xavier.razavet@nxp.com>
diff --git a/samples/net/openthread/shell/prj-ot-host.conf b/samples/net/openthread/shell/prj-ot-host.conf
index ccd248c..6c34b40 100644
--- a/samples/net/openthread/shell/prj-ot-host.conf
+++ b/samples/net/openthread/shell/prj-ot-host.conf
@@ -4,9 +4,6 @@
 CONFIG_NETWORKING=y
 CONFIG_NET_L2_OPENTHREAD=y
 
-# Use NVS as settings backend
-CONFIG_NVS=y
-
 # Logging
 CONFIG_LOG=y
 CONFIG_NET_LOG=y
@@ -28,9 +25,6 @@
 # Flash
 CONFIG_FLASH=y
 CONFIG_FLASH_MAP=y
-CONFIG_SETTINGS=y
-CONFIG_SETTINGS_NVS=y
-CONFIG_NVS=y
 
 # Enable OpenThread features set
 CONFIG_OPENTHREAD_MANUAL_START=y