Merge branch 'lighten uapi/bpf.h rebuilds'

Jakub Kicinski says:

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Last change in the bpf headers - disentangling BPF uapi from
netdevice.h. Both linux/bpf.h and uapi/bpf.h changes should
now rebuild ~1k objects down from the original ~18k. There's
probably more that can be done but it's diminishing returns.

Split into two patches for ease of review.
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Signed-off-by: Alexei Starovoitov <ast@kernel.org>