Vulkan: Support of float uniform matrixes (2,3,4). Bug:angleproject:2392 Change-Id: I97efea83e604d19b1745d9db4ab8f02997a1b7fc Reviewed-on: https://chromium-review.googlesource.com/962666 Commit-Queue: Luc Ferron <lucferron@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>