always use volume mount option when mounting a partition

From ROS, if enable adb using the vol.up and vol.down buttons, the
/system partition is mounted by the function ensure_path_mounted() but
with hardcoded mount options.  As a consequence, the blocks are
modified and the reboot in MOS is blocked by the dm_verity feature
that detects a corruption.

This patch forces the function ensure_path_mounted() to use the mount
options from the volume structure, that were previously read from the
fstab.

Change-Id: I748d32c14cb821f4aae5bcc430089dab45375515
Signed-off-by: Gaelle Nassiet <gaellex.nassiet@intel.com>
Signed-off-by: Jeremy Compostella <jeremy.compostella@intel.com>
diff --git a/roots.cpp b/roots.cpp
index 0d47577..c067bcc 100644
--- a/roots.cpp
+++ b/roots.cpp
@@ -115,7 +115,7 @@
     } else if (strcmp(v->fs_type, "ext4") == 0 ||
                strcmp(v->fs_type, "vfat") == 0) {
         result = mount(v->blk_device, v->mount_point, v->fs_type,
-                       MS_NOATIME | MS_NODEV | MS_NODIRATIME, "");
+                       v->flags, v->fs_options);
         if (result == 0) return 0;
 
         LOGE("failed to mount %s (%s)\n", v->mount_point, strerror(errno));