PD#SWPL-49064

Problem:
Need to support signed and encrypted AUCPU firmware.

Solution:
Add bl31 smc command to load signed/encrypted fw

Verify:
Load signed/encrypted AUCPU fw:
  Sign/encrypt aucpu_fw.bin
  mkdir /lib/firmware
  cp -v aucpu_fw.bin.dblk /lib/firmware/aucpu_fw.bin
  insmod aml_aucpu.ko print_level=0

Change-Id: Ib63e4332e5a21f27787365a2df59c0a69ccd1537
Signed-off-by: Lawrence Mok <lawrence.mok@amlogic.com>