time: Cleanup global variables and move them to the top

Move global xtime_lock and timekeeping_suspended values up
to the top of timekeeping.c

CC: Thomas Gleixner <tglx@linutronix.de>
CC: Eric Dumazet <eric.dumazet@gmail.com>
CC: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>