[clang] clang driver: enable fast unaligned access for Android on RISCV64 (PR #85704)

[via cfe-commits]

================
@@ -167,6 +167,10 @@ void riscv::getRISCVTargetFeatures(const Driver &D, const llvm::Triple &Triple,
     Features.push_back("-relax");
   }
 
+  // Android requires fast unaligned access on RISCV64.
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hiraditya wrote:

```
./bin/clang -mabi=lp64d --target=riscv64-linux-android -### -fsyntax-only ../clang/test/Driver/riscv-features.c -mno-strict-align
```

prints only one `"-target-feature" "+fast-unaligned-access"`

https://github.com/llvm/llvm-project/pull/85704