i2c: sh_i2c.c: support iccl and icch extension

R-mobile SoC (at least SH73A0) has extension bits to store 8th bit of iccl and icch.
This patch add support for the extentin bits.

Acked-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Tetsuyuki Kobayashi <koba@kmckk.co.jp>
diff --git a/include/configs/kzm9g.h b/include/configs/kzm9g.h
index 3a882e3..0132e9d 100644
--- a/include/configs/kzm9g.h
+++ b/include/configs/kzm9g.h
@@ -154,6 +154,7 @@
 /* I2C */
 #define CONFIG_CMD_I2C
 #define CONFIG_SH_I2C 1
+#define CONFIG_SH_I2C_8BIT
 #define CONFIG_HARD_I2C
 #define CONFIG_I2C_MULTI_BUS
 #define CONFIG_SYS_MAX_I2C_BUS  (2)