rootfs: don't put /usr/lib/ssl and /etc into debugfs
The /etc and /usr/lib/ssl directories were only put into the opkg-generated
debugfs because of a bug in opkg which means that a conffile has to exist if
we're running 'opkg status'. This is now fixed, so the workaround can be
reverted.
Signed-off-by: Ross Burton <ross.burton@intel.com>