ARM: shmobile: sh7372: use sh_clk_fsidiv_register() for FSI-DIV clocks

Now, sh7372 can use sh_clk_fsidiv_register() for FSI-DIV clocks.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Simon Horman <horms@verge.net.au>