sched/rt: Remove redundant nr_cpus_allowed test
Revert "fix previous commit D3rP"

This reverts commit a2970c9c1f801ea4ec8d179ed1fe1a2be7b70e8d.
Revert "ARM: 7527/1: uaccess: explicitly check __user pointer when !CPU_USE_DOMAINS"

This reverts commit fe68e50b81074fdefe9b73f7c160ec2d349663eb.