amdkfd - misc fixes + get_local_mem_info() port

[Edward O'Callaghan]

The following series applies on top of either master or the drm-next-4.9
branch. Apart from the couple of misc fixes here we port out the
'get_local_mem_info()' helper out of the ROCm kernel patch mountain
and hook that up so to be mainlined.

Edward O'Callaghan (4):

  [PATCH 1/4] amdkfd: Tidy up kfd_generate_gpu_id() uint64_t bitshift
  [PATCH 2/4] radeonkfd/amdkfd: Implement get_local_mem_info()
  [PATCH 3/4] amdkfd: Add some missing memset zero'ing in queue init
  [PATCH 4/4] amdkfd: Fix possible dangling ptr in kfd_dbgmgr_destroy()