[PATCH][gas][ARM] Document supported ARMv8 cores

[Matthew Wahab]

The documentation for the ARM target is missing supported ARMv8 cores. 
This patch adds the missing cores to those listed under the -mcpu option.

Tested by checking the generated html and pdf documents.

gas/
2014-02-04  Matthew Wahab  <matthew.wahab@arm.com>

	* doc/c-arm.texi (-mcpu=): Add cortex-a53, cortex-a57 and
	cortex-a72.
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