rules: add rule for accel devices

rules: add rule for accel devices

Accel (Compute Acceleration) are new devices for AI/ML computation:
https://docs.kernel.org/accel/introduction.html

They are part of DRM subsystem. Add them to 'render' group since
no other appropriate group in standard linux systems exist. This
can be changed when proper common user-space components will emerge,
and new group for acceleration devices access will be established.

Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>