[AArch64] Add bits/hwcap.h for aarch64 linux

[Szabolcs Nagy]

As noted in

https://sourceware.org/ml/libc-alpha/2014-02/msg00562.html

AArch64 uses HWCAP bits but they are not defined in sys/auxv.h.
This patch adds a copy of the linux v4.6 arm64 uapi asm/hwcap.h
definitions.

2016-06-22  Szabolcs Nagy  <szabolcs.nagy@arm.com>

	* sysdeps/unix/sysv/linux/aarch64/bits/hwcap.h: New.
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