fs/skeleton: allow rootfs not to be remounted read-write

[Peter: prefix option with TARGET_GENERIC_]
Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

fs/skeleton/etc/inittab

@@ -15,7 +15,7 @@
 
 # Startup the system
 null::sysinit:/bin/mount -t proc proc /proc
-null::sysinit:/bin/mount -o remount,rw /
+null::sysinit:/bin/mount -o remount,rw / # REMOUNT_ROOTFS_RW
 null::sysinit:/bin/mkdir -p /dev/pts
 null::sysinit:/bin/mkdir -p /dev/shm
 null::sysinit:/bin/mount -a