[Patch, ARM] check value of --with-arch against arm-arches.def

[Terry Guo]

Hi There,

This patch intends to check value of --with-arch against the arm-arches.def,
rather than current solution that use hard coded things in config.gcc.
Tested with various values of --with-arch and it works. Is it ok to trunk?

BR,
Terry

2013-12-30  Terry Guo  <terry.guo@arm.com>

     * config.gcc (arm*-*-*): Check --with-arch against arm-arches.def.
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