ADAC: Clear all internal state / context info

This patch clears the internal state and context information after
the authentication process is completed in the ADAC to ensure that
no sensitive data remains in memory.

Signed-off-by: Maulik Patel <maulik.patel@arm.com>
Change-Id: Ib22220f4a91a8b6520feb2a20ada3c265546c253
5 files changed