powerpc/mpc85xx: Add T4 device definitions

powerpc/mpc85xx: Add T4 device definitions

The T4 has added devices to previous corenet implementations:

* SEC has 3 more DECO units
* New PMAN device
* New DCE device

This doesn't add full support for the new devices. Just some
preliminary support.

Move PMAN LIODN to upper half of register

Despite having only one LIODN, the PMAN LIODN is stored in the
upper half of the register. Re-use the 2-LIODN code and just
set the LIODN as if the second one is 0. This results in the
actual LIODN being written to the upper half of the register.

Signed-off-by: Andy Fleming <afleming@freescale.com>