This patch implements the callback for orchestrating live activation
of Secure Partition based on the guidance provided in the Appendix
18.10 of the FF-A v1.3 ALP2 specification.
The callback relies on helper utilities that enable the LSP to send
live activation framework messages to SPMC after performing several
sanity checks.
Change-Id: I2730433ec57c0c1163281eff9de729c6e93f3366
Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>