v3dv: Add support for the on-disk shader cache

v3dv: Add support for the on-disk shader cache

Quoting Jason's commit message (afa8f5892), that also applies here:

"The Vulkan API provides a mechanism for applications to cache their
own shaders and manage on-disk pipeline caching themselves.
Generally, this is what I would recommend to application developers
and I've resisted implementing driver-side transparent caching in the
Vulkan driver for a long time.  However, not all applications do this
and, for some use-cases, it's just not practical."

Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9403>