ipv4: fib: Remove fib_info_hash_size.

We will allocate the fib_info hash tables per netns.

There are 5 global variables for fib_info hash tables:
fib_info_hash, fib_info_laddrhash, fib_info_hash_size,
fib_info_hash_bits, fib_info_cnt.

However, fib_info_laddrhash and fib_info_hash_size can be
easily calculated from fib_info_hash and fib_info_hash_bits.

Let's remove fib_info_hash_size and use (1 << fib_info_hash_bits)
instead.

Now we need not pass the new hash table size to fib_info_hash_move().

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Link: https://patch.msgid.link/20250228042328.96624-7-kuniyu@amazon.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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