[clang] [Driver] Update SYCL runtime library name and path for target-specific directories (PR #189053)

[Srividya Sundaram via cfe-commits]

https://github.com/srividya-sundaram created https://github.com/llvm/llvm-project/pull/189053

This patch updates the Clang driver to support the renamed SYCL runtime library (libsycl.so → libLLVMSYCL.so) and its new location in target-specific directories. These changes align with PR #[188770](https://github.com/llvm/llvm-project/pull/188770), which standardizes the SYCL runtime library naming and directory structure to match other LLVM runtime libraries.

**Changes**
**Library Naming**

- **Old**: libsycl.so
- **New**: libLLVMSYCL.so

**Directory Structure**
Both build and install directories now use target-specific subdirectories:

- **Old:** lib/libsycl.so
- **New:** lib/target-triple/libLLVMSYCL.so

For example, on x86_64-unknown-linux-gnu:

- **Old**: build/lib/libsycl.so → install/lib/libsycl.so
- **New**: build/lib/x86_64-unknown-linux-gnu/libLLVMSYCL.so → install/lib/x86_64-unknown-linux-gnu/libLLVMSYCL.so

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