[clang] [clang][RISCV] Remove some of the bits added with RISC-V big endian support (PR #192903)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp,h -- clang/lib/Basic/Targets.cpp clang/lib/Basic/Targets/OSTargets.h clang/lib/Driver/ToolChains/FreeBSD.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/lib/Basic/Targets.cpp b/clang/lib/Basic/Targets.cpp
index 453f05500..4ee4f86fc 100644
--- a/clang/lib/Basic/Targets.cpp
+++ b/clang/lib/Basic/Targets.cpp
@@ -497,8 +497,7 @@ std::unique_ptr<TargetInfo> AllocateTarget(const llvm::Triple &Triple,
   case llvm::Triple::riscv64be:
     switch (os) {
     case llvm::Triple::Linux:
-      return std::make_unique<LinuxTargetInfo<RISCV64TargetInfo>>(Triple,
-                                                                  Opts);
+      return std::make_unique<LinuxTargetInfo<RISCV64TargetInfo>>(Triple, Opts);
     default:
       return std::make_unique<RISCV64TargetInfo>(Triple, Opts);
     }

``````````

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https://github.com/llvm/llvm-project/pull/192903