drm/amd: Downgrade message about watermarks table after s0i3 to debug

This message shows up on s0i3 resume for DCN31 and DCN314 platforms but
it has been decided that this flow won't be changed and the message is
expected behavior.

Downgrade the message to debug.

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>