drm/amdgpu: Use new atomfirmware init for GC 9.4.3

Use the new atomfirmware initialization logic for GC 9.4.3 based ASICs
also. ASIC init logic doesn't consider boot clocks during init.

Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>