Save Socket Creation info as nanoseconds

New metrics are going to save latency information in nanoseconds.
To accomodate for this, change socketCreationTime and
socketCreationLatency to nanoseconds.  This does not change the units
for existing metrics.

Bug: 306760576
Flag: EXEMPT mechanical refactor
Test: m Bluetooth
Change-Id: Ica70f968847e8f41c51344851882baabb7d03945