Enable validation layers for custom devices and instances

Enable validation layers for custom devices and instances

Honor the --deqp-validation=enable command line option in tests using
custom devices and instances.

Affected tests:
dEQP-VK.api.buffer.*
dEQP-VK.api.device_init.*
dEQP-VK.api.external.memory.*
dEQP-VK.api.info.*
dEQP-VK.api.object_management.*
dEQP-VK.api.version_check.*
dEQP-VK.compute.basic.*
dEQP-VK.compute.device_group.*
dEQP-VK.device_group.*
dEQP-VK.image.swapchain_mutable.*
dEQP-VK.memory.allocation.*
dEQP-VK.memory.device_group_allocation.*
dEQP-VK.multiview.*
dEQP-VK.pipeline.push_descriptor.*
dEQP-VK.protected_memory.*
dEQP-VK.robustness.*
dEQP-VK.sparse_resources.*
dEQP-VK.synchronization.basic.semaphore.*
dEQP-VK.synchronization.cross_instance.*
dEQP-VK.synchronization.internally_synchronized_objects.*
dEQP-VK.synchronization.op.multi_queue.*
dEQP-VK.synchronization.smoke.*
dEQP-VK.synchronization.win32_keyed_mutex.*
dEQP-VK.wsi.*
dEQP-VK.ycbcr.format.*

Components: Vulkan
VK-GL-CTS issue: 1831

Change-Id: Id4f8f1d5053807740f3cb850554e9e80f5d7319b