drm/amd/display: Enable subvp high refresh up to 175hz

[Description]
Expand the SubVP policy to include up to 175hz displays
for better power saving on more display configs.

Reviewed-by: Chaitanya Dhere <chaitanya.dhere@amd.com>
Acked-by: Stylon Wang <stylon.wang@amd.com>
Signed-off-by: Alvin Lee <alvin.lee2@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>