panfrost: Split panfrost_device from panfrost_screen

We would like to access properties of the device in a
Gallium-independent way (for out-of-Gallium testing in the short-term,
and would help a theoretical Vulkan implementation in the long run).
Let's split up the struct.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4382>
16 files changed