Marvell/Armada7k8k: Introduce support for Armada-8040-McBin

Add new board description file Armada80x0McBin.dsc,
which uses common Armada7k8k.fdf file. By default
build capsule components.
Most of the interfaces are fully functional, except for:
- USB ports - it requires merging GPIO support and VBUS
  power supply enabling
- SdMmc ports - they are kept enabled, as no issues were
  observed on v1.3 board so far. However higher speed modes
  (HS200) and full stability will be gained after Xenon
  driver improvements merge.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Marcin Wojtas <mw@semihalf.com>
Reviewed-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Leif Lindholm <leif.lindholm@linaro.org>