drm/xe/xe2: Allocate extra pages for ccs during bo create

drm/xe/xe2: Allocate extra pages for ccs during bo create

Incase of bo move from PL_TT to PL_SYSTEM these pages will be used to
store ccs metadata from flat ccs. And during bo move to PL_TT from
PL_SYSTEM the metadata will be copied from extra pages to flat ccs. This
copy of ccs metadata ensures ccs remains unaltered between swapping out
of bo to disk and its restore to PL_TT.

Bspec:58796

v2:
 - For dgfx ensure system bit is not set.
 - Modify comments.(Thomas)

v3:
 - Separate out patch to modify main memory to ccs memory ratio.(Matt)

v4:
 - Update description for commit message.
 - Make bo allocation routine more readable.(Matt)

Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>