drm/xe: Refactor xe_ggtt balloon functions to make the node clear

drm/xe: Refactor xe_ggtt balloon functions to make the node clear

These operations are related to node. Convert them to the
new appropriate name space xe_ggtt_node.

v2: Also move arguments around for consistency (Lucas).
v3: s/node_balloon/node_insert_balloon and
    s/node_deballoon/node_remove_balloon (Michal).

Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240821193842.352557-10-rodrigo.vivi@intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>