Merge changes from topic "tbbr/fw_enc" into integration
* changes:
docs: qemu: Add instructions to boot using FIP image
docs: Update docs with firmware encryption feature
qemu: Support optional encryption of BL31 and BL32 images
qemu: Update flash address map to keep FIP in secure FLASH0
Makefile: Add support to optionally encrypt BL31 and BL32
tools: Add firmware authenticated encryption tool
TBB: Add an IO abstraction layer to load encrypted firmwares
drivers: crypto: Add authenticated decryption framework