aarch64: Fix +nocrypto handling

aarch64: Fix +nocrypto handling

Additionally, replace all checks for the AARCH64_FL_CRYPTO bit with
checks for (AARCH64_FL_AES | AARCH64_FL_SHA2) instead.  The value of the
AARCH64_FL_CRYPTO bit within isa_flags is now ignored, but it is
retained because removing it would make processing the data in
option-extensions.def significantly more complex.

This bug should have been picked up by an existing test, but a missing
newline meant that the pattern incorrectly allowed "+crypto+nocrypto".

gcc/ChangeLog:

	* common/config/aarch64/aarch64-common.cc
	(aarch64_get_extension_string_for_isa_flags): Fix generation of
	the "+nocrypto" extension.
	* config/aarch64/aarch64.h (AARCH64_ISA_CRYPTO): Remove.
	(TARGET_CRYPTO): Remove.
	* config/aarch64/aarch64-c.cc (aarch64_update_cpp_builtins):
	Don't use TARGET_CRYPTO.

gcc/testsuite/ChangeLog:

	* gcc.target/aarch64/options_set_4.c: Add terminating newline.
	* gcc.target/aarch64/options_set_27.c: New test.