[PATCH][AArch64] Fix feature dependencies for +simd and +crypto

[Szabolcs Nagy]

According to the gas manual, +simd implies +fp and +crypto implies +simd.
Make sure +nofp turns +simd, +crypto and +fp16 off.

gas/
2016-11-07  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* config/tc-aarch64.c (aarch64_features): Fix "simd" and "crypto".

gas/testsuite/
2016-11-07  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* gas/aarch64/illegal-crypto-nofp.d: New.
	* gas/aarch64/illegal-crypto-nofp.l: New.
	* gas/aarch64/illegal-fp16-nofp.d: New.
	* gas/aarch64/illegal-fp16-nofp.l: New.
	* gas/aarch64/illegal-fp16-nofp.s: New.

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