Update time-limited fgs tracked to use realtime.

Instead of using uptime, use realtime to do all the tracking for
time-limited FGS types - this is mainly to ensure the 24hr rolling
window is tracked accurately w.r.t. the time limits.

Bug: 330399444
Test: atest CtsFgsTimeoutTestCases
Change-Id: Ie6b3459cf4882b6a91c0a53fe2bd64901142957f
2 files changed