VCN: Adopt the API name changes of IpSecTransformState

Update VCN to adopt the API changes that include:
- getIpSecTransformState -> requestIpSecTransformState
- getTimestamp -> getTimestampMillis

Bug: 316603231
Test: atest FrameworksVcnTests; atest CtsVcnTestCases
Change-Id: I2498154c37ec2d8f8906a10cb3392326123619e8
3 files changed