panfrost: Remove the perf counters interface

The DRM backend has a dummy implementation and the non-DRM backend is
gone, so let's remove this perf counter interface.

Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
4 files changed