Rollup merge of #92117 - solid-rs:fix-kmc-solid-read-buf, r=yaahc

kmc-solid: Add `std::sys::solid::fs::File::read_buf`

This PR adds `std::sys::solid::fs::File::read_buf` to catch up with the changes introduced by #81156 and fix the [`*-kmc-solid_*`](https://doc.rust-lang.org/nightly/rustc/platform-support/kmc-solid.html) Tier 3 targets..