Marvell/Library: Introduce ArmadaBoardDescLib class

This patch adds a new library class that will be helpful
to describe a per-board information, which will be
processed by BoardDesc protocol.

Together with ArmadaSoCDescLib data it will be a flexible
solution allowing to provide complete information to
the drivers, replacing faulty MvHwDescLib.h.

Initially ArmadaBoardDescLib defines per-board UTMI
PHYs information structure.

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