[Crash-utility] Add an option "-c" for commamd runq

[WeiJiangang]

Hello Dave,
	The patch is used to improve the existing command, which adds an
option "-c" 
to the the command "runq". The option "-c" displays the timestamp
information about 
the runqueue each of cpu. The timstamp information, which accordings to the
kernel
version you use, may be the value of runqueue's member. for example,
rq.clock or 
rq.timestamp_last_tick, even runqueue.timestamp_last_tick.
	Besides, I have already tested it on rhel4.8/rehl5.7/rhel6.2,
without any error.
	The result like this:
>    crash> runq -c
>    CPU 0: 66789719522523
>    CPU 1: 66789719628339
>    CPU 2: 66789719519625

Regards,
Wei Jiangang
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