drm/i915/tgl: Move fault registers to their new offset

The fault registers moved to another offset. The old location is now
taken by the global MOCS registers, to be added in a follow up change.

Based on previous patches by Michel Thierry <michel.thierry@intel.com>.

Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190730180407.5993-2-lucas.demarchi@intel.com