Update documentation for AES-GCM-ESP keymat length

Added notes that keymat length must include 32 bits of salt.

Bug: 68672051
Test: Frameworks-net unit tests & IpSecManager CTS tests run
Change-Id: I0ae0c5be8a45b2374783b3bd1fa8bf930f15e687
1 file changed
tree: de8a8e45ce52d12a83134e3f3c5d12b7563ba43e
  1. core/
  2. services/
  3. tests/