edminiv2: increase malloc len to 256K

Malloc len of 128K caused a warning from
ehci_hcd asking for more.

Signed-off-by: Albert ARIBAUD <albert.u.boot@aribaud.net>
Acked-by: Prafulla Wadaskar <prafulla@marvell.com>

include/configs/edminiv2.h

@@ -222,7 +222,7 @@
 /*
  * Size of malloc() pool
  */
-#define CONFIG_SYS_MALLOC_LEN	(1024 * 128) /* 128kB for malloc() */
+#define CONFIG_SYS_MALLOC_LEN	(1024 * 256) /* 256kB for malloc() */
 
 /*
  * Other required minimal configurations