docs: Remove docs about macOS hardware drivers

We dropped support for hardware macOS drivers in afe134a49c ("asahi: Drop macOS
backend"), so drop the corresponding documentation. Layered and software drivers
are still supported on macOS for better or worse, so the main "Notes on macOS"
page can stay I think.

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/22213>

docs/drivers/asahi.rst

@@ -3,34 +3,14 @@ Asahi
 
 The Asahi driver aims to provide an OpenGL implementation for the Apple M1.
 
-Testing on macOS
------------------
-
-On macOS, the experimental Asahi driver may built with options:
-
-    -Dosmesa=true -Dglx=xlib -Dgallium-drivers=asahi,swrast
-
-To use, set the ``DYLD_LIBRARY_PATH`` environment variable:
-
-.. code-block:: console
-
-   DYLD_LIBRARY_PATH=/Users/nobody/mesa/build/src/gallium/targets/libgl-xlib/ glmark2 --reuse-context
-
-Only X11 apps are supported. XQuartz must be setup separately.
-
 Wrap (macOS only)
 -----------------
 
 Mesa includes a library that wraps the key IOKit entrypoints used in the macOS
 UABI for AGX. The wrapped routines print information about the kernel calls made
-and dump work submitted to the GPU using agxdecode.
-
-This library allows debugging Mesa, particularly around the undocumented macOS
-user-kernel interface. Logs from Mesa may compared to Metal to check that the
-UABI is being used correctly.
-
-Furthermore, it allows reverse-engineering the hardware, as glue to get at the
-"interesting" GPU memory.
+and dump work submitted to the GPU using agxdecode. This facilitates
+reverse-engineering the hardware, as glue to get at the "interesting" GPU
+memory.
 
 The library is only built if ``-Dtools=asahi`` is passed. It builds a single
 ``wrap.dylib`` file, which should be inserted into a process with the