[AArch64][GISel] Silence warning caused by llvm#130156

This caused build failures with -Werror

Author: sdesmalen-arm

llvm/lib/Target/AArch64/GISel/AArch64RegisterBankInfo.cpp

@@ -568,6 +568,7 @@ bool AArch64RegisterBankInfo::onlyUsesFP(const MachineInstr &MI,
     default:
       break;
     }
+    break;
   default:
     break;
   }