kselftests: timers: freq-step: Define ADJ_SETOFFSET if device has older kernel headers

On some systems, the kernel headers haven't been updated to include
ADJ_SETOFFSET, so define it in the test if needed.

Cc: Thomas Gleixner <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Miroslav Lichvar <[email protected]>
Cc: Richard Cochran <[email protected]>
Cc: Prarit Bhargava <[email protected]>
Cc: Stephen Boyd <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: [email protected]
Signed-off-by: John Stultz <[email protected]>

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