Fix compiler errors and switch to new pandecode API

We're adding a new pandecode api with MR mesa/mesa!24144 (merged), which will help us avoid some piglit crashes when pandecode is initialized more than once (e.g. panfrost_screen is created more than once by a single thread).

This MR also fixes some errors relating to v10 and updates paths in meson.build relating to bifrost and valhall disasm.