drm/msm: split rd debugfs file

Split into two instances, the existing $debugfs/rd which continues to
dump all submits, and $debugfs/hangrd which will be used to dump just
submits that cause gpu hangs (and eventually faults, but that will
require some iommu framework enhancements).

Signed-off-by: Rob Clark <robdclark@gmail.com>
3 files changed