tu: Implement VK_KHR_map_memory2
What does this MR do and why?
Implement VK_KHR_map_memory2.
Unmapping is still missing, but it passes
dEQP-VK.memory.mapping.*_map2
with drm-shim:
Test run totals:
Passed: 2233/2233 (100.0%)
Failed: 0/2233 (0.0%)
Not supported: 0/2233 (0.0%)
Warnings: 0/2233 (0.0%)
Waived: 0/2233 (0.0%)