[PATCH] AArch64: Remove unused _dl_aarch64_cap_flags

[Wilco Dijkstra]

Hi Adhemerval,

> I think it should be ok to remove all _dl_hwcap_string support since it
> is unused since 6099908fb84debee4c3bcb05d88769410c2aecd1. 

I can easily remove the other unused ones. There are a few targets that
define their own _dl_procinfo which then manually prints out the HWCAPS.
Is it useful to keep those?

Generic code could just dump HWCAPs as hex if deemed useful for
debugging.

Cheers,
Wilco