drm/amdkfd: Add spatial partitioning support in KFD

This patch introduces multi-partition support in KFD.
This patch includes:
- Support for maximum 8 spatial partitions in KFD.
- Initialize one HIQ per partition.
- Management of VMID range depending on partition mode.
- Management of doorbell aperture space between all
  partitions.
- Each partition does its own queue management, interrupt
  handling, SMI event reporting.
- IOMMU, if enabled with multiple partitions, will only work
  on first partition.
- SPM is only supported on the first partition.
- Currently, there is no support for resetting individual
  partitions. All partitions will reset together.

Signed-off-by: Mukul Joshi <[email protected]>
Tested-by: Amber Lin <[email protected]>
Reviewed-by: Felix Kuehling <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

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