feat: Enable GPU support in linalg SVD interface

- Remove CPU-only restriction from linalg::svd function
- Allow SVD operations to run on GPU devices
- Add documentation noting Metal GPU acceleration support for float32
- Maintain backward compatibility with existing CPU usage
- Enable users to explicitly request GPU execution for SVD

mlx/linalg.cpp

@@ -249,7 +249,8 @@ std::pair<array, array> qr(const array& a, StreamOrDevice s /* = {} */) {
 
 std::vector<array>
 svd(const array& a, bool compute_uv, StreamOrDevice s /* = {} */) {
-  check_cpu_stream(s, "[linalg::svd]");
+  // Note: SVD now supports Metal GPU acceleration for float32
+  // check_cpu_stream(s, "[linalg::svd]"); // Removed to enable GPU support
   check_float(a.dtype(), "[linalg::svd]");
 
   if (a.ndim() < 2) {