powerpc/85xx: move SRIO configuration out of corenet_ds.h
The P5040 does not have SRIO, so don't put the SRIO definitions in
corenet_ds.h. They belong in the board-specific header files.
Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>