New tests for VK_KHR_synchronization2

New tests for VK_KHR_synchronization2

This change adds none_stage tests that exercise PIPELINE_STAGE_NONE
as well as MEMORY_ACCESS_READ|WRITE_BIT and new generic layouts.

Event tests were also extends to test GPU-only scenarios using new
VK_EVENT_CREATE_DEVICE_ONLY_BIT_KHR.

Components: Vulkan

VK-GL-CTS issue: 2365

New tests:
dEQP-VK.synchronization2.basic.event.*_device_only
dEQP-VK.synchronization2.none_stage.*

Affects:
dEQP-VK.synchronization*

Change-Id: I86e056054a6541526140fd15fb53bef9359b6b28