Some Radeon cards in D3D11 would not report AMD or ATI in the
Renderer string. Fix this by also checking for 'Radeon'.

Bug: angleproject:2572
Change-Id: I866c3042e35448deff627efdb8e94fcbc68abf01
Reviewed-on: https://chromium-review.googlesource.com/1171363Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>