Remove all code paths and policies below SM50

[fbusato]

[fbusato]

@jrhemstad for confirmation, this issue doesn't include sm32, sm50, right?

[bernhardmgruber]

@jrhemstad for confirmation, this issue doesn't include sm32, sm50, right?

I revised the title to sm35 and below.

[bernhardmgruber]

From some internal discussions, it seems sm_37 can be removed as well. So we only need to keep sm_50 and higher.