arm: rmobile: alt: Change clock of SCIF to external clock

Change clock of SCIF for Alt board is used to external clock.
This changes to using external clock.

Signed-off-by: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

include/configs/alt.h

@@ -88,6 +88,7 @@
 /* SCIF */
 #define CONFIG_SCIF_CONSOLE
 #define CONFIG_CONS_SCIF2
+#define CONFIG_SCIF_USE_EXT_CLK
 #undef	CONFIG_SYS_CONSOLE_INFO_QUIET
 #undef	CONFIG_SYS_CONSOLE_OVERWRITE_ROUTINE
 #undef	CONFIG_SYS_CONSOLE_ENV_OVERWRITE
@@ -149,7 +150,7 @@
 #define CONFIG_SH_TMU_CLK_FREQ  (CONFIG_SYS_CLK_FREQ / 2) /* EXT / 2 */
 #define CONFIG_PLL1_CLK_FREQ    (CONFIG_SYS_CLK_FREQ * 156 / 2)
 #define CONFIG_P_CLK_FREQ	(CONFIG_PLL1_CLK_FREQ / 24)
-#define CONFIG_SH_SCIF_CLK_FREQ CONFIG_P_CLK_FREQ
+#define CONFIG_SH_SCIF_CLK_FREQ	14745600 /* External Clock */
 
 #define CONFIG_SYS_TMU_CLK_DIV  4