net: remove SLAB_MEM_SPREAD flag usage

The SLAB_MEM_SPREAD flag used to be implemented in SLAB, which was
removed as of v6.8-rc1, so it became a dead flag since the commit
16a1d96835 ("mm/slab: remove mm/slab.c and slab_def.h"). And the
series[1] went on to mark it obsolete to avoid confusion for users.
Here we can just remove all its users, which has no functional change.

[1] https://lore.kernel.org/all/20240223-slab-cleanup-flags-v2-1-02f1753e8303@suse.cz/

Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://lore.kernel.org/r/20240228030658.3512782-1-chengming.zhou@linux.dev
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

net/socket.c

@@ -343,7 +343,7 @@ static void init_inodecache(void)
 					      0,
 					      (SLAB_HWCACHE_ALIGN |
 					       SLAB_RECLAIM_ACCOUNT |
-					       SLAB_MEM_SPREAD | SLAB_ACCOUNT),
+					       SLAB_ACCOUNT),
 					      init_once);
 	BUG_ON(sock_inode_cachep == NULL);
 }