make arch code use xtime_update() instead of do_timer()

[Torben Hohn]

move do_timer() into kernel/time/timekeeping.c
and provide a version which properly takes the xtime_lock()

finally makes do_timer() and xtime_lock into a header file
private to kernel/time

xtime_lock is still used by kernel/hrtimer.c and kernel/time.c
i am not sure, whether the small header file is the right
thing though.



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