UPSTREAM: net: SO_RCVMARK socket option for SO_MARK with recvmsg()

Adding a new socket option, SO_RCVMARK, to indicate that SO_MARK
should be included in the ancillary data returned by recvmsg().

Renamed the sock_recv_ts_and_drops() function to sock_recv_cmsgs().

Signed-off-by: Erin MacNeil <lnx.erin@gmail.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Acked-by: Marc Kleine-Budde <mkl@pengutronix.de>
Link: https://lore.kernel.org/r/20220427200259.2564-1-lnx.erin@gmail.com


Signed-off-by: Jakub Kicinski <kuba@kernel.org>
(cherry picked from commit 6fd1d51c)
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I99221c48889fcc5a0633f633b6da73ecd66e26f2