drm/amdgpu: add count field for the SDMA NOP packet v2

This is added to support the burst NOP

v2: squash the typo fix

Signed-off-by: Jammy Zhou <Jammy.Zhou@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>

drm/amdgpu: Add initial VI support

This adds initial support for VI asics. This
includes Iceland, Tonga, and Carrizo. Our inital
focus as been Carrizo, so there are still gaps in
support for Tonga and Iceland, notably power
management.

Acked-by: Christian König <christian.koenig@amd.com>
Acked-by: Jammy Zhou <Jammy.Zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>