Remove sys-assert dependency

Remove sys-assert dependency

sys-assert controls how core dumps are handled in the system.
It provides a system/image wide capability.

Product images might choose not to install it or they might
prefer an alternative core dump service (e.g., systemd
coredump).

Therefore, individual packages should not explicitly depend
on sys-assert.

Change-Id: Icd83879a9f676464c2fae4f06676c7e8fabd53e6
Signed-off-by: Mikko Ylinen <mikko.ylinen@intel.com>