sepolicy: Add sched_pelt_multiplier node to proc_sched

Add a new genfs_contexts policy for performance that contains the new
label.

Bug: 290305186
Bug: 290189958
Signed-off-by: Qais Yousef <qyousef@google.com>
Change-Id: Ia60ce8f22594a667e722ad2db60afc0f357b571c
1 file changed