drm/amdgpu: Enable IH CAM on GFX9.4.3

This patch enables IH CAM on GFX9.4.3 ASIC.

Signed-off-by: Mukul Joshi <mukul.joshi@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>