Inconsistent behaviour with respect to the ticks in the *_when() directives

[Sebastian Huber]

Hello,

I noticed that we have an inconsistent behaviour with respect to the 
handling of the ticks member in the *_when() directives. In all *_when() 
directives the ticks member is not used to calculate the watchdog 
expiration time, see also:

https://lists.rtems.org/pipermail/users/2020-December/068006.html

However, the rtems_task_wake_when() directive ignores the ticks member 
of the time of day completely, unlike the rtems_timer_fire_when() and 
rtems_timer_server_fire_when() directives which check that the ticks are 
valid and then ignore them.

We should use a common way to deal with the ticks member. If we ignore 
the value, then this would make it more difficult to support it in the 
future. The watchdog implementation supports a nanoseconds resolution. 
If we check the ticks in rtems_task_wake_when() existing applications 
may get an error status after the change.

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