APF: Add an experiment flag to holdback the fix in aosp/2276160

Add an experiment flag to use the RA lifetime calculation fix in
aosp/2276160. It can be disabled if any OEM finds additional battery
usage and want to use the old buggy behavior again.

Bug: 268444451
Test: Flashed, set the device config flag and check the result
Test: atest android.net.apf.ApfTest
Test: atest FrameworksNetTests NetworkStackTests
Test: atest NetworkStackIntegrationTests
Change-Id: Iac9acefd18996e0ad00f579b4014569798b95d72
3 files changed