selftests/timers: Add adjtimex validation test from timetest suite

This adds a adjtimex validation test which checks the behavior
for a set of valida and invalid inputs. So far this only tests
ADJ_FREQUENCY, but hopefully will grow.

Cc: Shuah Khan <[email protected]>
Cc: Prarit Bhargava <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Richard Cochran <[email protected]>
Signed-off-by: John Stultz <[email protected]>
Tested-by: Prarit Bhargava <[email protected]>
Signed-off-by: Shuah Khan <[email protected]>

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