mpc83xx: Fix the SATA clock setting of 837x targets

Currently the SATA controller clock is configured as CSB clock,
usually the CSB clock is 400/333/266MHz.

However, The SATA IP block is only guaranteed to operate up to
200 MHz as stated in the HW spec.

The bug is reported by Joe D'Abbraccio <ljd015@freescale.com>

This patch makes the SATA clock as half of CSB clock.

Signed-off-by: Dave Liu <daveliu@freescale.com>
Signed-off-by: Kim Phillips <kim.phillips@freescale.com>

include/configs/MPC837XEMDS.h

@@ -96,7 +96,7 @@
  */
 #define CFG_SCCR_TSEC1CM	1	/* CSB:eTSEC1 = 1:1 */
 #define CFG_SCCR_TSEC2CM	1	/* CSB:eTSEC2 = 1:1 */
-#define CFG_SCCR_SATACM		SCCR_SATACM_1	/* CSB:SATA[0:3] = 1:1 */
+#define CFG_SCCR_SATACM		SCCR_SATACM_2	/* CSB:SATA[0:3] = 2:1 */
 
 /*
  * System IO Config

include/configs/MPC837XERDB.h

@@ -108,7 +108,7 @@
 /* System Clock Configuration Register */
 #define CFG_SCCR_TSEC1CM	1		/* eTSEC1 clock mode (0-3) */
 #define CFG_SCCR_TSEC2CM	1		/* eTSEC2 clock mode (0-3) */
-#define CFG_SCCR_SATACM		SCCR_SATACM_1	/* SATA1-4 clock mode (0-3) */
+#define CFG_SCCR_SATACM		SCCR_SATACM_2	/* SATA1-4 clock mode (0-3) */
 
 /*
  * System IO Config