drm/amd: Update MEC HQD loading code for KFD

Various bug fixes and improvements that accumulated over the last two
years.

Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Acked-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
11 files changed