Fix whitespace in uapi/linux/tcp.h.

List of things fixed:
  - Two of the socket options were idented with spaces instead of tabs.
  - Trailing whitespace in some lines.
  - Improper spacing around parenthesis caught by checkpatch.pl.
  - Mix of space and tabs in tcp_word_hdr union.

Signed-off-by: Danilo Carvalho <doak@google.com>
Link: https://lore.kernel.org/r/20210108222104.2079472-1-doak@google.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>