fs/orangefs: remove ORANGEFS_CACHE_CREATE_FLAGS

The flags were set to SLAB_RED_ZONE when CONFIG_DEBUG_SLAB was enabled.
With SLAB gone, this is now dead code so remove it. With SLUB, debugging
options including red zoning can be set for orangefs caches by the
slab_debug boot parameter.

Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>