zfs: merge openzfs/zfs@887a3c533

Notable upstream pull request merges:
#15022 5caeef02f RAID-Z expansion feature
#15457 887a3c533 Increase L2ARC write rate and headroom
#15504 1c1be60fa Unbreak F

zfs: merge openzfs/zfs@887a3c533

Notable upstream pull request merges:
#15022 5caeef02f RAID-Z expansion feature
#15457 887a3c533 Increase L2ARC write rate and headroom
#15504 1c1be60fa Unbreak FreeBSD world build after 3bd4df384

Obtained from: OpenZFS
OpenZFS commit: 887a3c533b94a4b70075e310f15c45b9dee19410

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