dt/bindings: Introduce the FSL QorIQ DPAA BMan

The Buffer Manager is part of the Data-Path Acceleration Architecture
(DPAA).  BMan supports hardware allocation and deallocation of buffers
belonging to pools originally created by software with configurable
depletion thresholds.  This binding covers the CCSR space programming
model

Signed-off-by: Emil Medve <Emilian.Medve@Freescale.com>
Change-Id: I3ec479bfb3c91951e96902f091f5d7d2adbef3b2
Signed-off-by: Scott Wood <scottwood@freescale.com>