dtrace: Add support for manual triggered cyclics

dtrace: Add support for manual triggered cyclics

In some scenarios it is better if a client of cyclic susbstem can reprogram cyclic on
his own. This is not possible with current implementation.

This chage adds cyclic_reprogram() that can be used to schedule cyclic from inside and
outside of its handler. A manually triggered cyclic is distinguished from other types
by having its interval set to -1.

Orabug: 26384803

Signed-off-by: Tomas Jedlicka <tomas.jedlicka@oracle.com>
Reviewed-by: Kris Van Hees <kris.van.hees@oracle.com>