task_profiles: add ServicePerformance to legacy device policy

Since we are adding SCHED_SP_SYSTEM into framework, the policy is needed
on older releases as well.

Bug: 201428466
Test: Build
Signed-off-by: Wei Wang <wvw@google.com>
Change-Id: I0784820bfec84fd8ef98f2feb2caee084d0a14a2
Merged-In: I0784820bfec84fd8ef98f2feb2caee084d0a14a2