drm/amd/display: Add debug options to change sharpen policies

drm/amd/display: Add debug options to change sharpen policies

[WHY]
Add options to change sharpen policy based on surface format
and scaling ratios.

[HOW]
Add sharpen_policy to change policy based on surface format
and scale_to_sharpness_policy based on scaling ratios.

Reviewed-by: Jun Lei <jun.lei@amd.com>
Signed-off-by: Samson Tam <Samson.Tam@amd.com>
Signed-off-by: Alex Hung <alex.hung@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>