ipmr: Convert ipmr_rtm_getroute() to RCU.

ipmr_rtm_getroute() calls __ipmr_get_table(), ipmr_cache_find(),
and ipmr_fill_mroute().

The table is not removed until netns dismantle, and net->ipv4.mr_tables
is managed with RCU list API, so __ipmr_get_table() is safe under RCU.

struct mfc_cache is freed by mr_cache_put() after RCU grace period,
so we can use ipmr_cache_find() under RCU.  rcu_read_lock() around
it was just to avoid lockdep splat for rhl_for_each_entry_rcu().

ipmr_fill_mroute() calls mr_fill_mroute(), which properly uses RCU.

Let's drop RTNL for ipmr_rtm_getroute() and use RCU instead.

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260228221800.1082070-6-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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