packagegroup-core-boot: correct runtime dependencies for non-sysvinit system

hwclock, ifup-down and modutils are all sysvinit scripts that
are available in systemd also.

[YOCTO #4969]

Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>