layers: Validate samplerAnisotropy device feature
layers: Validate samplerAnisotropy device feature

Change-Id: I8b1262c34612870b9c8ebb1f62e7d6755219606f

KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools