net: align SO_RCVMARK required privileges with SO_MARK

net: align SO_RCVMARK required privileges with SO_MARK

The commit referenced in the "Fixes" tag added the SO_RCVMARK socket
option for receiving the skb mark in the ancillary data.

Since this is a new capability, and exposes admin configured details
regarding the underlying network setup to sockets, let's align the
needed capabilities with those of SO_MARK.

Fixes: 6fd1d51cfa25 ("net: SO_RCVMARK socket option for SO_MARK with recvmsg()")
Signed-off-by: Eyal Birger <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>