libutils: Avoid unncessary error messages

This error case already returns a unique error code and could be quite reasonably
triggered in a normally behaving application.

libplatsupport: Consistently print NS

Previous print mixed printing NS and ticks, this unifies to just printing NS

platsupport: Check for io port support in pit_init

This prevents the pit driver from claiming to be successfully initialized when it does not
have access to any I/O ports.

libplatsupport: Correct format types for printf

platsupport: remove unused constant in pit.c

platsupport: expose pit constants, improve pit ltimer

- expose pit constants (min and max ns it can handle)
- modify pit ltimer to be able to set absolute and relative timeouts for
the pit that are greater than what the pit can handle by setting
a shorter timerout
- however, periodic timeouts which are greater than the max value the
pit can handle are NOT yet implemented
- otherwise just set a shorter timeout
- update pit error messages and codes. As the PIT is not an absolute
time source it doesn't make sense to return ETIME, instead return EINVAL
as the arguments are invalid

libplatsupport: Change log level to warning

Remove pstimer from PIT

users are expected to interact with PIT directly

Fix whitespace

- remove trailing whitespace
- remove duplicate blank lines
- remove blank lines at end of file

fix licenses

libplatsupport: Use stubtimer timeout method

Remove a bunch of duplicated code.

libplatsupport: Expand timer properties

Indicate the types of timeout supported in the properties.

libplatsupport: Use stubtimer timeout method

Remove a bunch of duplicated code.

libplatsupport: Expand timer properties

Indicate the types of timeout supported in the properties.