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As do_gettimeofday is very old and deprecated, use ktime instead

This also fixed the old conversion to nanoseconds in a4l_init_time.
Signed-off-by: Roman Stratiienko <roman.stratiienko@globallogic.com>
[Jan: leave note on drive-by fix of a4l_init_time]
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>