[llvm] [RISCV] Update the canonical extension order (PR #192392)

[via llvm-commits]

github-actions[bot] wrote:

<!--PREMERGE ADVISOR COMMENT: Linux-->
# :penguin: Linux x64 Test Results

* 173272 tests passed
* 3254 tests skipped
* 1 test failed

## Failed Tests
(click on a test name to see its output)

### LLVM-Unit
<details>
<summary>LLVM-Unit.TargetParser/_/TargetParserTests/RISCVISAInfoTest/CanonicalExtensionOrderVP</summary>

```
Script:
--
/home/gha/actions-runner/_work/llvm-project/llvm-project/build/unittests/TargetParser/./TargetParserTests --gtest_filter=RISCVISAInfoTest.CanonicalExtensionOrderVP
--
/home/gha/actions-runner/_work/llvm-project/llvm-project/llvm/unittests/TargetParser/RISCVISAInfoTest.cpp:331
Value of: llvm::detail::TakeExpected(MaybeISAInfo)
Expected: succeeded
  Actual: failed  (experimental extension requires explicit version number `p`)


```
</details>

If these failures are unrelated to your changes (for example tests are broken or flaky at HEAD), please open an issue at https://github.com/llvm/llvm-project/issues and add the `infrastructure` label.

https://github.com/llvm/llvm-project/pull/192392