drm/radeon: set correct CE ram size for CIK

CE ram size is 32k/0k/0k for GFX/CS0/CS1 with CIK

Ported from amdgpu driver.

Signed-off-by: Jammy Zhou <Jammy.Zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org