provide the interface for DAL to disable uclk switch on navi10.
in this case, the uclk will be fixed to maximum.
this is a workaround when display configuration causes underflow issue.
Signed-off-by: Kenneth Feng <kenneth.feng@amd.com>
Reviewed-by: Kevin Wang <kevin1.wang@amd.com>
Reviewed-by: Evan Quan <evan.quan@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>