Set SPI Allocation Timeout to One Hour

This change increases the default expiration length of an SA to 1h. The
IPsec API expects that SPIs are allocated indefinitely, but potential
for instability requires that these get cleaned up automatically. As
such, the duration was chosen as a sane, but long timeout value.

Bug: 72316671
Test: Added CTS tests to enforce this behavior
Change-Id: I47aef9cea4a09da253b2ec048a8797af5fa25529