ANDROID: sched: Export sched_setattr_nocheck

This symbol is needed for certain vendor modules which cannot rely on
only the sysfs interface for uclamp alone.

Bug: 170697030
Signed-off-by: J. Avila <elavila@google.com>
Change-Id: Ic904ade83a45d259cfc95501e6b81e6c5a0e90a0
(cherry picked from commit 0edac9cb95fb2fa292a4b25ac77b125cde28b674)