nak: Don't se .yld or .reuse_mask on Blackwell+

These appear to be gone and everything works without setting them so
let's just treat them like missing bits for now.  According to the CUDA
12.8 disassembler, they still do something but it's not the same thing
they did before and I don't have docs to tell me what they really do.
Best to just not set them.

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35843>

src/nouveau/compiler/nak/sm70_encode.rs

@@ -214,11 +214,13 @@ impl SM70Encoder<'_> {
 
     fn set_instr_deps(&mut self, deps: &InstrDeps) {
         self.set_field(105..109, deps.delay);
-        self.set_bit(109, deps.yld);
         self.set_field(110..113, deps.wr_bar().unwrap_or(7));
         self.set_field(113..116, deps.rd_bar().unwrap_or(7));
         self.set_field(116..122, deps.wt_bar_mask);
-        self.set_field(122..126, deps.reuse_mask);
+        if self.sm < 120 {
+            self.set_bit(109, deps.yld);
+            self.set_field(122..126, deps.reuse_mask);
+        }
     }
 }