drm/i915/guc: Replace CTB array with explicit members

drm/i915/guc: Replace CTB array with explicit members

Upcoming GuC firmware will always require just two CTBs and we
also plan to configure them with different sizes, so definining
them as array is no longer suitable.

v2: Use %p for ptrdiff print
v3: Use %tx for ptrdiff print

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210603230408.54856-1-matthew.brost@intel.com