Merge branch 'Add support to set window_clamp from bpf setsockops'

Prankur gupta says:

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This patch contains support to set tcp window_field field from bpf setsockops.

v2: Used TCP_WINDOW_CLAMP setsockopt logic for bpf_setsockopt (review comment addressed)

v3: Created a common function for duplicated code (review comment addressed)

v4: Removing logic to pass struct sock and struct tcp_sock together (review comment addressed)
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Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>