apps/kernel_sample: fix async io test
apps/kernel_sample: fix async io test

aio.c compiles only when CONFIG_EXAMPLES_KERNEL_SAMPLE_AIO is enable,
so in order to use it's functions we need to check whether
CONFIG_EXAMPLES_KERNEL_SAMPLE_AIO is enabled.

Signed-off-by: Oleg Lyovin <9e7fd33cf90c7e429276114f54b1f8488150523e@partner.samsung.com>

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