[POWERPC] 86xx: update immap_86xx.h for the 8610

Update the definition of the global utilities structure (ccsr_guts) in
immap_86xx.h and add some related macros for the Freescale 8610 SOC.

Signed-off-by: Timur Tabi <timur@freescale.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>