Vulkan: Clamp the point size range to have a min value of 1.0 Bug: angleproject:2658 Change-Id: I32ff9aa27b064d9977eea0b83b18c52c4e42e38d Reviewed-on: https://chromium-review.googlesource.com/1096054 Commit-Queue: Luc Ferron <lucferron@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>