drm/amdkfd: Drop _nocpsch suffix from shared functions

Several functions in DQM are shared between cpsch and nocpsch code.
Remove the misleading _nocpsch suffix from their names.

Signed-off-by: Yong Zhao <yong.zhao@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>