rtems: Constify rtems_task_wake_when()

[Sebastian Huber]

The time of day pointer can be made constant in this directive.

[Sebastian Huber <sebastian.huber@…>]

In 523867d/rtems:

rtems: Constify rtems_task_wake_when()

Add a parameter to _TOD_Validate() to disable the validation of the
ticks member.

There are two reasons for this change. Firstly, in
rtems_task_wake_when() was a double check for time_buffer == NULL (one
in rtems_task_wake_when() and one in _TOD_Validate()). Secondly, the
ticks member is ignored by rtems_task_wake_when(). This was done with a
write of zero to the ticks member and thus a modification of the
user-provided structure. Now the structure is no longer modified.
Using a mask parameter is quite efficient. You just have to load an
immediate value and there are no additional branches in _TOD_Validate().

Close #4406.

[Sebastian Huber <sebastian.huber@…>]

In 2588e8b/rtems-docs:

c-user: Constify rtems_task_wake_when()

Update #4406.

[Sebastian Huber <sebastian.huber@…>]

In 45a34953/rtems:

rtems: Add TOD_Ticks_validation

Replace defines with an enum.

Update #4406.

[Sebastian Huber <sebastian.huber@…>]

In 98cb84e/rtems:

arm/altera-cyclone-v: Fix compile error

Update #4406.