Check if the Vulkan instance version is 1.1+, and if so, set
VkApplicationInfo::apiVersion to 1.1 (which signals to the validation
layers that ANGLE will use Vulkan 1.1 functionality.

Bug: angleproject:2968
Change-Id: I6808a1a0b1ace74976a7476f77d686e137a1e746
Reviewed-on: https://chromium-review.googlesource.com/c/1387757
Commit-Queue: Ian Elliott <ianelliott@google.com>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>