drm/lima: add show_fdinfo for drm usage stats

This exposes an accumulated active time per client via the fdinfo
infrastructure per execution engine, following
Documentation/gpu/drm-usage-stats.rst.
In lima, the exposed execution engines are gp and pp.

Signed-off-by: Erico Nunes <nunes.erico@gmail.com>
Signed-off-by: Qiang Yu <yuq825@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230312233052.21095-4-nunes.erico@gmail.com