ipmr: Don't hold RTNL for ipmr_rtm_route().

ipmr_mfc_add() and ipmr_mfc_delete() are already protected
by a dedicated mutex.

rtm_to_ipmr_mfcc() calls __ipmr_get_table(), __dev_get_by_index(),
amd ipmr_find_vif().

Once __dev_get_by_index() is converted to dev_get_by_index_rcu(),
we can move the other two functions under that same RCU section
and drop RTNL for ipmr_rtm_route().

Let's do that conversion and drop ASSERT_RTNL() in
mr_call_mfc_notifiers().

Signed-off-by: Kuniyuki Iwashima <kuniyu@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260228221800.1082070-16-kuniyu@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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