net: team: Annotate reads and writes for mixed lock accessed values

net: team: Annotate reads and writes for mixed lock accessed values

The team_port's "index" and the team's "en_port_count" are read in
the hot transmit path, but are only written to when holding the rtnl
lock.

Use READ_ONCE() for all lockless reads of these values, and use
WRITE_ONCE() for all writes.

Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Marc Harvey <marcharvey@google.com>
Reviewed-by: Kuniyuki Iwashima <kuniyu@google.com>
Link: https://patch.msgid.link/20260409-teaming-driver-internal-v7-1-f47e7589685d@google.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>