drm/amdgpu: create MES-V11 usermode queue for GFX

A Memory queue descriptor (MQD) of a userqueue defines it in
the hw's context. As MQD format can vary between different
graphics IPs, we need gfx GEN specific handlers to create MQDs.

This patch:
- Adds a new file which will be used for MES based userqueue
  functions targeting GFX and SDMA IP.
- Introduces MQD handler functions for the usermode queues.

V1: Worked on review comments from Alex:
    - Make MQD functions GEN and IP specific

V2: Worked on review comments from Alex:
    - Reuse the existing adev->mqd[ip] for MQD creation
    - Formatting and arrangement of code

V3:
    - Integration with doorbell manager

V4: Review comments addressed:
    - Do not create a new file for userq, reuse gfx_v11_0.c (Alex)
    - Align name of structure members (Luben)
    - Don't break up the Cc tag list and the Sob tag list in commit
      message (Luben)
V5:
   - No need to reserve the bo for MQD (Christian).
   - Some more changes to support IP specific MQD creation.

V6:
   - Add a comment reminding us to replace the amdgpu_bo_create_kernel()
     calls while creating MQD object to amdgpu_bo_create() once eviction
     fences are ready (Christian).

V7:
   - Re-arrange userqueue functions in adev instead of uq_mgr (Alex)
   - Use memdup_user instead of copy_from_user (Christian)

V9:
   - Moved userqueue code from gfx_v11_0.c to new file mes_v11_0.c so
     that it can be reused for SDMA userqueues as well (Shashank, Alex)

V10: Addressed review comments from Alex
   - Making this patch independent of IP engine(GFX/SDMA/Compute) and
     specific to MES V11 only, using the generic MQD structure.
   - Splitting a spearate patch to enabling GFX support from here.
   - Verify mqd va address to be non-NULL.
   - Add a separate header file.

Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: Christian Koenig <christian.koenig@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Shashank Sharma <shashank.sharma@amd.com>
Signed-off-by: Arvind Yadav <arvind.yadav@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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