mips: octeon: Add cvmx-pemx-defs.h header file

Import cvmx-pemx-defs.h header file from 2013 U-Boot. It will be used
by the later added drivers to support PCIe and networking on the MIPS
Octeon II / III platforms.
Signed-off-by: NAaron Williams <awilliams@marvell.com>
Signed-off-by: NStefan Roese <sr@denx.de>