On Linux with the amdgpu driver, the GL_RENDERER string contains
precise kernel and DRM version info. We should sanitize this info
before using these strings for user privacy.

Bug: chromium:1181193
Change-Id: I047d1abf5b51412b4258a021761cc450385ef0fe
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2727658
Commit-Queue: Jonah Ryan-Davis <jonahr@google.com>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>