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

[Szabolcs Nagy]

On 22/06/16 16:36, Szabolcs Nagy wrote:
> 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.
> 

ping.

i'd like to fix this in 2.24 if that's ok.