systemd: upgrade to 216

systemd: upgrade to 216

Upgrade systemd from 213 to 216.

systemd-older-kernel.patch is removed as it's fixed in 216.

0001-uClibc-doesn-t-implement-pwritev-preadv.patch is removed because
the file it patches has been removed from the project.

0001-util-Including-missing.h-to-get-MAX_HANDLE_SZ.patch is removed because
it has been merged.

0001-missing.h-add-fake-__NR_memfd_create-for-MIPS.patch is backported
to fix compilation error for mips.

Below are the required kernel versions for systemd 216.
        Linux kernel >= 3.0
        Linux kernel >= 3.3 for loop device partition support features with nspawn
        Linux kernel >= 3.8 for Smack support

(From OE-Core rev: 58c432b2725ad8b78d02cb91a6ab405d425c01cc)

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>