drm/amd/display: Expand set_pixel_clock debug log message

[Why]
For more informative debugging.

[How]
Add timing generator and PLL ids to output, to make it clear which pixel
clock is being set.

Signed-off-by: Ken Chalmers <ken.chalmers@amd.com>
Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
Acked-by: Leo Li <sunpeng.li@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>