whitechapel: make vframe-secure a system heap

The GPU driver uses vframe-secure for secure allocations, so the
corresponding DMA heap file should be visible to all processes so
use the dmabuf_system_secure_heap_device type instead.

In order for this type to be used, we need to ensure that the HAL
Allocator has access to it, so update hal_graphics_allocator_default.te

Finally, since there are no longer any buffer types associated with the
vframe_heap_device type, remove it.

Bug: 182090311
Test: run cts-dev -m CtsDeqpTestCases --module-arg CtsDeqpTestCases:include-filter:dEQP-VK.protected_memory.stack.stacksize_64 and ensure secure allocations succeed
Test: Play DRM-protected video in ExoPlayer and ensure videos render correctly via MFC->DPU.
Change-Id: Id341e52322a438974d4634a4274a7be2ddb4c9fe
4 files changed