[llvm] [Offload] Fixes typo in aarch64 triple (PR #91622)

[Tulio Magno Quites Machado Filho via llvm-commits]

tuliom wrote:

By the way, it fixes this error:

```
May 09 05:24:16 /builddir/build/BUILD/llvm-project-19.0.0.src/offload/plugins-nextgen/host/src/rtl.cpp:436:26: error: no member named 'aarch64_le' in 'llvm::Triple'; did you mean 'aarch64_be'?
May 09 05:24:16   436 |     return llvm::Triple::aarch64_le;
May 09 05:24:16       |            ~~~~~~~~~~~~~~^~~~~~~~~~
May 09 05:24:16       |                          aarch64_be
May 09 05:24:16 /builddir/build/BUILD/llvm-project-19.0.0.src/llvm/include/llvm/TargetParser/Triple.h:52:5: note: 'aarch64_be' declared here
May 09 05:24:16    52 |     aarch64_be,     // AArch64 (big endian): aarch64_be
May 09 05:24:16       |     ^
May 09 05:24:16 1 error generated.
```
The full log is available at: https://download.copr.fedorainfracloud.org/results/@fedora-llvm-team/llvm-snapshots-big-merge-20240509/fedora-rawhide-aarch64/07428061-llvm/builder-live.log.gz

https://github.com/llvm/llvm-project/pull/91622