drm/amdgpu: Update HDP 4.4.2 clock gating flags

HDP 4.4.2 clockgating is enabled by default, update the flags
accordingly.

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