drm/amdgpu: Refine ip detection log message

'add ip block' causes a confusion if the blocks are disabled later with
ip_block_mask. Instead change to 'detected' and also add device context.

Signed-off-by: Lijo Lazar <lijo.lazar@amd.com>
Reviewed-by: Asad Kamal <asad.kamal@amd.com>
Suggested-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>