drm/amd/display: Add logging for display MALL refresh setting

[WHY]
Add log entry for when display refresh from MALL
settings are sent to SMU.

Fixes: 1664641e ("drm/amd/display: Add logger for SMU msg")
Signed-off-by: Wesley Chalmers <Wesley.Chalmers@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>