radeon_hd: Fix crash of driver on multiple open

* open_count only got raised on initial open,
  subsequent opens didn't increment the counter
  thus when they exited the driver unloaded
  causing app_server to crash
* Thanks to hamishm for pointing out that
  the if checks the pre-increment number
* Resolves #10452
* Add a kdl debug command to radeon_hd
intel_extreme: Fix crash of driver on multiple open

* open_count only got raised on initial open,
  subsequent opens didn't increment the counter
  thus when they exited the driver unloaded
  causing app_server to crash
* Thanks to hamishm for pointing out that
  the if checks the pre-increment number
* Resolves #10452
scheduler: Always update core load at thread reenqueue
intel_cstates: Fix integer division inaccuracy

Integer division could have result in an out of bound substate.