libxml2: Fix CVE-2022-40303 && CVE-2022-40304

Upstream-Status: Backport from https://gitlab.gnome.org/GNOME/libxml2/-/commit/c846986356fc149915a74972bf198abc266bc2c0 && https://gitlab.gnome.org/GNOME/libxml2/-/commit/1b41ec4e9433b05bb0376be4725804c54ef1d80b



(From OE-Core rev: b46d0b7a)

Signed-off-by: Hitendra Prajapati <hprajapati@mvista.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Chee Yang Lee <chee.yang.lee@intel.com>
Signed-off-by: Steve Sakoman <steve@sakoman.com>