drm_hwcomposer: Ensure composer has master access to DRM/KMS

Allocator service is always loaded before Composer service.
Kernel will assign master access to the first client that
opened /dev/dri/cardX node.

Allocator should immediately execute drmDropMaster() to
allow Composer service to acquire master privileges.

If this does not happen, the composer should gracefully exit,
otherwise a lot of DRM ioctls will fail without displaying anything
on the UI.

Signed-off-by: Roman Stratiienko <r.stratiienko@gmail.com>
1 job for check-master-access in 32 seconds (queued for 1 second)