asahi: Copy panfrost's bo cache

asahi: Copy panfrost's bo cache

Massive performance gains, some fps before/after numbers from glmark2:

   [shading] 1486 -> 2391
   [refract] 87   -> 127
   [terrain] 32   -> 56

...and it's basically for free with enough copy/paste, so thank you to Boris
Brezillon for an excellent Asahi patch, the LRU cache seems to work great on M1
:-p

There are a few minor changes I made from panfrost, notably adjusting the
constants to account for 16KiB pages and switching from pthread_mutex to
simple_mtx to be less weird in Mesa.

For context on the design, the following commits evolved it in Panfrost and
their commit messages may be useful... The logic in this module is the product
of years of mistakes and correcting course :-)

   f06809cdcaf ("panfrost: Evict the BO cache when allocation fails")
   77d04989135 ("panfrost: Fix major flaw in BO cache")
   ee82f9f07e1 ("panfrost: Try to evict unused BOs from the cache")
   2225383af8b ("panfrost: Make sure the BO is 'ready' when picked from the cache")
   9af4aeaaf7c ("panfrost: Don't return imported/exported BOs to the cache")

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19971>