CSD: Fix setCsd TestApi logic

When executing the Gts interactive tests noticed that the csd was not
properly resetted. The main reason was because the timestamp was using
the global time instead of the boot time. This would cause that the next
entries would be deleted since they would be older than the CSD window.

Bug: 248566547
Test: atest GtsInteractiveAudioTestCases -- --module-arg
GtsInteractiveAudioTestCases: instrumentation-arg:ENABLE_MANUAL:=true
Change-Id: I002d4019768342ba3a2cca53b54a5b3d310b45c3