drm/amdgpu: Added ISR for CP ECC/EDC interrupt v2.

ISR will DRM_ERROR ECC error message.

v2:
Remove CZ only limitation.
Rebase.

Signed-off-by: David Panariti <David.Panariti@amd.com>
Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>