coldfire: cpu5282: increase malloc space to fix crash on start u-boot

The malloc space is to small to boot, the current uboot 2013.10-rcX,
This will fix the startup problems by increasing the mallog space to 4MiB.

Signed-off-by: Jens Scharsig (BuS Elektronik) <esw@bus-elektronik.de>

include/configs/eb_cpu5282.h

@@ -152,7 +152,7 @@
 #define	CONFIG_SYS_SDRAM_SIZE		CONFIG_SYS_SDRAM_SIZE0
 
 #define CONFIG_SYS_MONITOR_LEN		0x20000
-#define CONFIG_SYS_MALLOC_LEN		(256 << 10)
+#define CONFIG_SYS_MALLOC_LEN		(4 * 1024 * 1024)
 #define CONFIG_SYS_BOOTPARAMS_LEN	64*1024
 
 /*