Enable secure memory support for FVPs ...

- Use the TrustZone controller on Base FVP to program DRAM access
  permissions. By default no access to DRAM is allowed if
  'secure memory' is enabled on the Base FVP.
- The Foundation FVP does not have a TrustZone controller but instead
  has fixed access permissions.
- Update FDTs for Linux to use timers at the correct security level.
- Starting the FVPs with 'secure memory' disabled is also supported.

Limitations:
Virtio currently uses a reserved NSAID. This will be corrected in
future FVP releases.

Change-Id: I0b6c003a7b5982267815f62bcf6eb82aa4c50a31

Increase default amount of RAM for Base FVPs in FDTs ...

- Large RAM-disks may have trouble starting with 2GB of memory.
- Increase from 2GB to 4GB in FDT.

Change-Id: I12c1b8e5db41114b88c69c48621cb21247a6a6a7

ARMv8 Trusted Firmware release v0.2