[LV][NFC] Fix "cpu" attribute in some partial-reduce*.ll tests (llvm#163518)

Author: david-arm

llvm/test/Transforms/LoopVectorize/AArch64/partial-reduce-dot-product.ll

@@ -2697,4 +2697,4 @@ for.body:                                         ; preds = %for.body.lr.ph, %fo
 !9 = !{!"llvm.loop.vectorize.predicate.enable", i1 true}
 !10 = !{!"llvm.loop.vectorize.enable", i1 true}
 attributes #0 = { vscale_range(1,16) "target-features"="+sve" }
-attributes #1 = { vscale_range(1,16) "target-features"="+neon,+dotprod,+sve" "cpu"="neoverse-v2" }
+attributes #1 = { vscale_range(1,16) "target-features"="+neon,+dotprod,+sve" "target-cpu"="neoverse-v2" }