[qca-nss-clients] ipsecmgr: v2: support GCM mode

- Added code to support RFC4106 GCM cryptographic mode.
- The GCM key is contructed by appending nonce value to the
  the cipher key and does not use RT attributes

Change-Id: Ibcf3a149f4497803aac398746be2d503f937de17
Signed-off-by: Tanmay V Jagdale <tjagdale@codeaurora.org>
2 files changed