xattr: remove rbtree-based simple_xattr infrastructure

Now that all consumers (shmem, kernfs, pidfs) have been converted to
use the rhashtable-based simple_xattrs with pointer-based lazy
allocation, remove the legacy rbtree code path. The rhashtable
implementation provides O(1) average-case lookup with RCU-based lockless
reads, replacing the O(log n) rbtree with reader-writer spinlock
contention.

Link: https://patch.msgid.link/20260216-work-xattr-socket-v1-6-c2efa4f74cb7@kernel.org
Acked-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>

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