drm: panthor-rs: Hook-up ioctls to C code

All but bo_mmap_offset hooked up.

Also need to figure out these warnings:

warning: `extern` block uses type `kernel::bindings::lockdep_map`, which is not FFI-safe
  --> ../drivers/gpu/drm/panthor-rs/file.rs:54:16
   |
54 |         pfile: *mut bindings::panthor_file,
   |                ^^^^^^^^^^^^^^^^^^^^^^^^^^^ not FFI-safe
   |
   = help: consider adding a member to this struct
   = note: this struct has no fields

Signed-off-by: Rob Herring (Arm) <robh@kernel.org>