riscv64: Make odrefresh recognize RISC-V target instead of aborting.

Bug: 271573990
Test: make sure that odrefresh does not crash on cuttlefish boot
      $ lunch aosp_cf_riscv64_phone-userdebug && m
      $ launch_cvd --gpu_mode=drm_virgl
      # grep logcat for odrefresh, observe no crash dump

Change-Id: Ifaf3b5e407927187ce5ed3bc5033598bd08e7d94
diff --git a/odrefresh/odr_config.h b/odrefresh/odr_config.h
index aa91875..6f4d940 100644
--- a/odrefresh/odr_config.h
+++ b/odrefresh/odr_config.h
@@ -276,6 +276,7 @@
       case art::InstructionSet::kX86_64:
         return std::make_pair(art::InstructionSet::kX86, art::InstructionSet::kX86_64);
       case art::InstructionSet::kRiscv64:
+        return std::make_pair(art::InstructionSet::kNone, art::InstructionSet::kRiscv64);
       case art::InstructionSet::kThumb2:
       case art::InstructionSet::kNone:
         LOG(FATAL) << "Invalid instruction set " << isa_;