iris: Nuke flags from iris_bufmgr that can read from devinfo

Now that devinfo is stored in iris_bufmgr we can nuke this duplicated
flags.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19650>
1 file changed