memory: brcmstb: dpfe: introduce DPFE API v3

Introduce code to handle DPFE API v3. We also change the driver to
default to v3 by default and use API v2 only for select chips.

Signed-off-by: Markus Mayer <mmayer@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>