powerpc/srio: Update the SRIO LIODN registers and ID table macro

For some PowerPC platforms, LIODN registers for SRIO ports are
in SRIO register address space. So the ccsr_rio structure should
be updated for those LIODN registers.

In addition, add a new macro "SET_SRIO_LIODN_BASE" to create
the SRIO LIODN ID table based on the SRIO LIODN register address.

Signed-off-by: Liu Gang <Gang.Liu@freescale.com>
Acked-by: York Sun <yorksun@freescale.com>