genxml: Make MI_STORE_DATA_IMM more consistent

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: "13.0 17.0" <mesa-stable@lists.freedesktop.org>
(cherry picked from commit dc9abd0e6b448292c025ed1024fcaa8ef1a4edaa)
3 files changed