drm/amdgpu: enable mes kiq N-1 test on sienna cichlid

Enable kiq support on gfx10.3, enable mes kiq (n-1)
test on sienna cichlid, so that mes kiq can be tested on
sienna cichlid. The patch can be dropped once mes kiq
is functional.

Signed-off-by: Jack Xiao <Jack.Xiao@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>