Remove attempt to write sched_compat_yield

The sched_compat_yield option was eliminated in Linux 2.6.38 by commit
ac53db596cc0 ("sched: Use a buddy to implement yield_task_fair()") and
as a result, the following error is printed to the log during boot up.

init: write_file: Unable to open '/proc/sys/kernel/sched_compat_yield':
No such file or directory"

Bug: 30034121
Change-Id: Idbdb68de0cb3ab1f67d82a4d66af880bcfdfe261
(cherry picked from commit 724dfbac)