arch-gcn3: Delete extraneous registers header
arch-gcn3: Delete extraneous registers header

This file is a duplicate of arch/amdgpu/gcn3/gpu_registers.hh and is in
the wrong location. It should be removed to avoid mistakenly editing the
wrong file.

Change-Id: Ie96e22fe8f78fda954af788b472ec2df4782e4a5
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/53743
Reviewed-by: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>
Maintainer: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Reviewed-by: Matt Sinclair <d2406197fb1bedd1e23c70c50c510ff0e9ab0f5b@gmail.com>
Maintainer: Matt Sinclair <d2406197fb1bedd1e23c70c50c510ff0e9ab0f5b@gmail.com>

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