sh: clkfwk: clock-sh7724: all div6_clks use SH_CLK_DIV6_EXT()

Current div6 clocks can specify their current parent clocks
from its register value if it is registered
by sh_clk_div6_reparent_register().
This patch modifies all div6 clocks into SH_CLK_DIV6_EXT().

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

arch/sh/include/cpu-sh4/cpu/sh7724.h

@@ -314,5 +314,6 @@ enum {
 
 extern struct clk sh7724_fsimcka_clk;
 extern struct clk sh7724_fsimckb_clk;
+extern struct clk sh7724_dv_clki;
 
 #endif /* __ASM_SH7724_H__ */