drm/xe: Normalize XE_VM_FLAG* names

Rename XE_VM_FLAGS_64K to XE_VM_FLAG_64K to follow the other names and
s/GT/TILE/ that got missed in commit 08dea767 ("drm/xe: Move
migration from GT to tile").

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://lore.kernel.org/r/20230718193924.3084759-1-lucas.demarchi@intel.com


Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>