i2c: sh_i2c: Update to new CONFIG_SYS_I2C framework

This updates to new I2C framwwork on sh_i2c.
And this also updates boards(kzm9g and ecovec) that using sh_i2c.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/board/renesas/ecovec/ecovec.c b/board/renesas/ecovec/ecovec.c
index e2d365a..fb4acf3 100644
--- a/board/renesas/ecovec/ecovec.c
+++ b/board/renesas/ecovec/ecovec.c
@@ -57,8 +57,7 @@
 
 	outl(inl(MSTPCR2) & ~0x10000000, MSTPCR2);
 
-	i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
-	i2c_set_bus_num(CONFIG_SYS_I2C_MODULE); /* Use I2C 1 */
+	i2c_set_bus_num(1); /* Use I2C 1 */
 
 	/* Read MAC address */
 	i2c_read(0x50, 0x10, 0, mac, 6);