Revert "ck-3.16: use tif_need_resched() in cond_resched()"

This reverts commit 6a180442f154c5a624ee377dacfcc0b8631eb1e0.
ck-3.16: fix rescheduling with preemptible kernel
Merge branch 'ck-3.16' into pf-3.16
Merge remote-tracking branch 'upstream/pf-3.16' into pf-3.16
configs: desktop: (re-)enabled uvesa

Was enabled in pf-3.14 (see f40590522c9da7a179a06799fffb73e08f1c8fec), and is most likely needed for nvidia tty console.
When I switched to pf-3.15 branch, I took the configs from pf-3.13 instead of pf-3.14. So all changes done in pf-3.14 got lost.
Configs > harmonized some options
Desktop config > Enabled AppArmor
Vostro 2520 Config > Enabled AppArmor

Conflicts:
	configs/dell-vostro-2520.config