tests,gpu-compute: Replace gcn3 tests with vega testlib tests

Any X86 quick tests were set to use GCN3_86. This was to minimize the
number of gem5 targets to build during the quick tests. Since the
introduction of VEGA, we wish to test VEGA during the quick tests. As
such, this patch will replace all GCN3_X86 tests with VEGA_X86 tests.

Change-Id: Ibdd7832e43a284936db5102d41161388bc721bd1
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/59012
Reviewed-by: Matthew Poremba <matthew.poremba@amd.com>
Reviewed-by: Matt Sinclair <mattdsinclair@gmail.com>
Maintainer: Matt Sinclair <mattdsinclair@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
9 files changed