Relax protected heap allocation tests - continuation

Relax protected heap allocation tests - continuation

Some implementations have limitations on protected heap
allocations, and these limitations cannot be queried
using the Vulkan API. This change allows an out-of-memory
to happen after a certain number of allocations to
compensate that.

Fix protected memory allocation to be done on small
allocation chunks and ignore allocation failures
if there is at least 80 of concurrent allocations
at a time.

VK-GL-CTS issue: 3257

Affects:
dEQP-VK.memory.allocation.random.*

Components: Vulkan
Change-Id: I32ed020195ff468de468bbd8527dec1d7f0db183