Pass the VkPhysicalDeviceProperties to GenerateDefaultConfig to initialize the
pbuffer size limitations in a platform independent way.

BUG=angleproject:2622

Change-Id: Id99bc505a1965cc037c5dcd65af031c1c655d424
Reviewed-on: https://chromium-review.googlesource.com/1126406
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Luc Ferron <lucferron@chromium.org>