e2fsprogs: add alternatives handling of lsattr as well

Building busybox with CONFIG_LSATTR=y and installing that in the same
filesystem as e2fsprogs breaks:

  ERROR: ... do_rootfs: Postinstall scriptlets of ['busybox'] have failed. If the intention is to defer them to first boot,
  then please place them into pkg_postinst_ontarget:${PN} ().
  Deferring to first boot via 'exit 1' is no longer supported.

Fix that by also alternatifying lsattr just as chattr already is.

Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 96703961)
Signed-off-by: Steve Sakoman <steve@sakoman.com>