power-libperfmgr: Remove cpu_load_up relative boost to PID

Increasingly, cpu_load_up exists as a tool to boost stray expensive
frames rather than to increase the PID setpoint, so this change reflects
that and seeks to prevent power regressions in its use towards this goal

Bug: 261130508
Test: manual
Change-Id: I6608f92decbdfc59d92b4e5716a75b323c1d2c3e
1 file changed