VK_EXT_pageable_device_local_memory test coverage

VK_EXT_pageable_device_local_memory test coverage

This CL adds basic support for the pageableDeviceLocalMemory feature. Normally
CTS enables all known features by default, but in this case we don't
enable pageableDeviceLocalMemory by default and just to targetting
testing with a variant of the extisting dEQP-VK.memory.allocation.*
tests.

This CL also adds coverage for vkSetDeviceMemoryPriorityEXT() by
extending the existing static VK_EXT_memory_priority test with a
dynamic variant that changes the memory priority after it has
been allocated.

New tests:

dEQP-VK.memory.pageable_allocation.*
dEQP-VK.memory.binding.priority_dynamic.*

Affects:

dEQP-VK.memory.allocation.*
dEQP-VK.memory.device_group_allocation.*
dEQP-VK.memory.binding.*

Components: Vulkan

VK-GL-CTS issue: 3060

Change-Id: Idb4e63556c8807ba2f636c90dab397f4d116223d