[PATCH, AARCH64] support s2_<op1>_<Cn>_<Cm>_<op2> sys reg

[Zhenqiang Chen]

Hi,

Current parse_sys_reg only supports s3_<op1>_<Cn>_<Cm>_<op2>. But
according to the document,

  integer sys_op0 = 2 + UInt(o0)

o0 is bit-19.

So sys_op0 can be 2 or 3.

This patch changes GAS to to add s2_<op1>_<Cn>_<Cm>_<op2> support.
OK for trunk?

Thanks!
-Zhenqiang

ChangeLog
2013-11-12  Zhenqiang Chen  <zhenqiang.chen@linaro.org>

        * config/tc-aarch64.c (parse_sys_reg): Support S2_<op1>_<Cn>_<Cm>_<op2>.
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