Merge branch 'net: skbuff: skb bitfield compaction - bpf'

Jakub Kicinski says:

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I'm trying to make more of the sk_buff bits optional.
Move the BPF-accessed bits a little - because they must
be at coding-time-constant offsets they must precede any
optional bit. While at it clean up the naming a bit.

v1: https://lore.kernel.org/all/20230308003159.441580-1-kuba@kernel.org/
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Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>