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tests/amdgpu: refactoring and update amd_basic tests

Vitaly Prosyak requested to merge mr/igt-gpu-tools-drmlib2 into master 
1. Create auxiliary directory amdgpu into igt-gpu-tools/lib
   Put all helpers and reusable functions into this directory using
   the following assumptions:
   - group memory alloc/free functions into separate file amd_memory.c and h.
   - group command submissions helper functions for GFX, COMPUTE and SDMA into
     separate file amd_command_submission.c and h.
   - for compute put nop command submission into separate file amd_compute.c and h.
   - for graphics put command submission into separate file amd_gfx.c and h.
   - for fence put command submission into separate file amd_fence.c and h.

2. Simplify implementation and reduce the number of local variables and allocations.

3. The file igt-gpu-tools/tests/amdgpu/amd_basic.c has only functions responsible
   for single sub test:
   - amdgpu_memory_alloc
   - amdgpu_userptr_test
   - amdgpu_command_submission_gfx
   - amdgpu_command_submission_compute
   - amdgpu_command_submission_multi_fence
   - amdgpu_command_submission_sdma
   - amdgpu_semaphore_test

   No helper functions into amd_basic.c file.

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