Metal: fix SDK condition macro for mathMode. It was missing conditions for tvOS and visionOS and the conditions were > instead of >=. Bug: chromium:383994655 Change-Id: I0a565a7028a3fe43b745419d9bac1da0abcc99be Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6972592 Reviewed-by: Alexey Knyazev <lexa.knyazev@gmail.com> Commit-Queue: Geoff Lang <geofflang@chromium.org>