Blackfin: cm-bf548: increase monitor len

Recent features enabled by default require a larger monitor size for the
cm-bf548 port, so bump it up a bit.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

include/configs/cm-bf548.h

@@ -64,7 +64,7 @@
 #define CONFIG_EBIU_FCTL_VAL	(BCLK_4)
 #define CONFIG_EBIU_MODE_VAL	(B0MODE_FLASH)
 
-#define CONFIG_SYS_MONITOR_LEN	(384 * 1024)
+#define CONFIG_SYS_MONITOR_LEN	(512 * 1024)
 #define CONFIG_SYS_MALLOC_LEN	(640 * 1024)