dpaa2: add console support for FDT based systems

Add DPAA2 console support for MC and AIOP (latter untested) for FDT
systems. ACPI systems are prepared but need some proper bus function
in order to get the address from MC (and likely a file splitup then).
This will come at a later stage once other ACPI/FDT bus parts are
cleared up.
The work was originally done in July 2022 and finally switched to
bus_space[1] lately to be ready for main.

Suggested by: andrew [1]
Reviewed by: dsl
Differential Revision: https://reviews.freebsd.org/D38592

(cherry picked from commit 72ef722b2a34b8f94fd639b05881242686480f05)