Add flags= in fstab to fix unhandled fstab line

Change-Id: I5068331236a7aa680a68c703e4d4bab8f8a35bce

recovery.fstab

@@ -4,7 +4,7 @@
 /data		ext4		/dev/block/platform/155a0000.ufs/by-name/USERDATA	flags=encryptable=footer;length=-20480
 /cache		ext4		/dev/block/platform/155a0000.ufs/by-name/CACHE
 /efs			ext4		/dev/block/platform/155a0000.ufs/by-name/EFS		flags=backup=1;display="EFS"
-/modem		emmc		/dev/block/platform/155a0000.ufs/by-name/RADIO	display="Modem"
-/modem_debug	emmc		/dev/block/platform/155a0000.ufs/by-name/CP_DEBUG	subpartitionof=/modem
+/modem		emmc		/dev/block/platform/155a0000.ufs/by-name/RADIO	flags=display="Modem"
+/modem_debug	emmc		/dev/block/platform/155a0000.ufs/by-name/CP_DEBUG	flags=subpartitionof=/modem
 /external_sd	vfat		/dev/block/mmcblk0p1 /dev/block/mmcblk0			flags=display="Micro SDcard";storage;wipeingui;removable;settingsstorage
 /usbstorage	vfat		/dev/sde1 /dev/sde							flags=display="USB Storage";storage;wipeingui;removable