[RISCV][NFC] Remove duplicate extensions from tt-ascalon-d8 CPU (#137865)

Sscofpmf is already in RVA23S64 and Zicsr is in RVA20U64. I also added a
check against Sscofpmf. NFC.

Author: mshockwave

clang/test/Driver/riscv-cpus.c

@@ -251,6 +251,7 @@
 // MCPU-TT-ASCALON-D8-SAME: "-target-feature" "+zvl256b"
 // MCPU-TT-ASCALON-D8-SAME: "-target-feature" "+zvl32b"
 // MCPU-TT-ASCALON-D8-SAME: "-target-feature" "+zvl64b"
+// MCPU-TT-ASCALON-D8-SAME: "-target-feature" "+sscofpmf"
 // MCPU-TT-ASCALON-D8-SAME: "-target-feature" "+svinval"
 // MCPU-TT-ASCALON-D8-SAME: "-target-feature" "+svnapot"
 // MCPU-TT-ASCALON-D8-SAME: "-target-feature" "+svpbmt"

llvm/lib/Target/RISCV/RISCVProcessors.td

@@ -480,11 +480,9 @@ def TENSTORRENT_ASCALON_D8 : RISCVProcessorModel<"tt-ascalon-d8",
                                                  !listconcat(RVA23S64Features,
                                                  [FeatureStdExtSmaia,
                                                   FeatureStdExtSsaia,
-                                                  FeatureStdExtSscofpmf,
                                                   FeatureStdExtSsstrict,
                                                   FeatureStdExtZfbfmin,
                                                   FeatureStdExtZfh,
-                                                  FeatureStdExtZicsr,
                                                   FeatureStdExtZvbc,
                                                   FeatureStdExtZvfbfmin,
                                                   FeatureStdExtZvfbfwma,