le_tc/kernel: Add missing CONFIG_SCHED_TICKLESS wrapper
le_tc/kernel: Add missing CONFIG_SCHED_TICKLESS wrapper

clock_timer() interface is available only when CONFIG_SCHED_TICKLESS is not defined.
So the test case used to test the clock_timer() should also be made available
only when CONFIG_SCHED_TICKLESS is not defined.

Otherwise when CONFIG_SCHED_TICKLESS is enabled, build error occurs.

Signed-off-by: Lokesh B V <a10c1c2561c872cd1fd5899c4340d5ec87a91507@partner.samsung.com>

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