Writing to the FVP LED register should be a 32bit access.

- Writing to this register with a 64bit access can cause a
  Systen Error Exception on some models.

Change-Id: Ibcf5bdf7ab55707db61c16298f25caff50e1ff7e
FDTs for v5.2 Foundation model

- The Foundation FVP is a cut down version of the Base FVP and as
  such lacks some components.
- Three FDTs are provided.
  fvp-foundation-gicv2legacy-psci:
    Use this when setting the Foundation FVP to use GICv2. In this
    mode the GIC is located at the VE location, as described in the
    VE platform memory map.
  fvp-foundation-gicv3-psci :
    Use this when setting the Foundation FVP to use GICv3. In this
    mode the GIC is located at the Base location, as described in the
    Base platform memory map.
  fvp-foundation-gicv2-psci :
    Use this when setting the Foundation FVP to use GICv3, but Linux
    is expected to use GICv2 emulation mode. In this mode the GIC is
    located at the Base location, but the GICv3 is used in GICv2
    emulation mode.

Change-Id: I9d69bcef35c64cc8f16550efe077f578e55aaae5
Do not enable CCI on Foundation FVP

- The Foundation FVP only has one cluster and does not have
  CCI.

Change-Id: If91e81ff72c52e448150089c4cfea3e4d6ae1232
Add GICv3 ITS to FDTs

- The interrupt addresses need to be updated to work.

Change-Id: Icdd00177095ae9e4eb7b13718762f92e29b1465c
Add Foundation FVP documentation

Change-Id: I5e47ba96e128d3a793517441f5a6c9f2ccbdfc66
Fix documentation issues in v0.2 release

Change-Id: I4e2a9daa97e3be3d2f53894f2ec7947ba6bb3a16