Merge branch 'fib-notifications-cleanup'

Jiri Pirko says:

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ipv4: fib: FIB notifications cleanup

Ido says:

The first patch moves the core FIB notification code to a separate file,
so that code related to FIB rules is placed in fib_rules.c and not
fib_trie.c. The reason for the change will become even more apparent in
follow-up patchset where we extend the FIB rules notifications.

Second patch removes a redundant argument.
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Signed-off-by: David S. Miller <davem@davemloft.net>