[PATCH] AArch64: Add hp-timing.h

[Wilco Dijkstra]

Hi Adhemerval,

> Any particular reason why you haven't enabled HP_TIMING_INLINE to 1?

Well, what exactly is it used for? I've never quite understood the reasoning behind
hp-timing. It seems to me it just slows down ld.so with extra timing calls which are
unused 100% of the time. So I don't see a reason to enable it on AArch64. However
with the header in place, it's easy to set it to 1 and rebuild if needed.

Cheers,
Wilco