remove ttm trace and add iova debugfs (v2)

[StDenis, Tom]

Should add I was able to read/write system memory mapped by amdgpu with these patches in place on my polaris10 device (with iommu enabled of course).

________________________________________
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of Tom St Denis <tom.stdenis at amd.com>
Sent: Monday, September 18, 2017 13:33
To: amd-gfx at lists.freedesktop.org
Cc: dri-devel at lists.freedesktop.org
Subject: remove ttm trace and add iova debugfs (v2)

In this respin I add some changes per feedback and make the iova
entry have proper read/write methods which access pages mapped
by amdgpu.  So there is no need for /dev/mem or /dev/fmem anymore
when reading system memory.

Patches 3/4 are unchanged and remove the TTM trace from amdgpu
and from TTM itself.


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