drm/amdgpu: add gfx10 hw debug mode enable and disable calls

Similar to GFX9 debug devices, set the hardware debug mode by draining
the SPI appropriately prior the mode setting request.

Because GFX10 has waves allocated by the work group boundary and each
SE's SPI instances do not communicate, the SPI drain time is much longer.
This long drain time will be fixed for GFX11 onwards.

Also remove a bunch of deprecated misplaced references for GFX10.3.

Signed-off-by: Jonathan Kim <jonathan.kim@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>