[wasm] De-templatize GetBuiltinCallDescriptor

The interface descriptor can be looked by via the builtins name, hence
we do not need the template parameter. This also removes redundancy (and
potential errors) for passing the builtin name twice, via the template
parameter and a function parameter.

R=thibaudm@chromium.org

Bug: v8:11384, v8:11453
Change-Id: Id4184a371e8ab8a66ff0b4eb65b4bd87f285149e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2704172Reviewed-by: Thibaud Michaud <thibaudm@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#72866}