configs: ls1012a: Increase CONFIG_SYS_MALLOC_LEN value

Previous attempt to increase CONFIG_SYS_MALLOC_LEN was done in commit
c084a8ed ("configs: ls1012a: Increase CONFIG_SYS_MALLOC_LEN size")
which increased malloc memory to ~1M.

PFE firmware alone requires 3M of dynamic memory allocation and
therefore, increase the config value to a larger value i.e 5M. This size
should be enough as of now to accommodate further memory requirements.
Signed-off-by: NKuldeep Singh <kuldeep.singh@nxp.com>
Reviewed-by: NPriyanka Jain <priyanka.jain@nxp.com>

include/configs/ls1012a_common.h

@@ -10,6 +10,7 @@
 
 #include <asm/arch/config.h>
 #include <asm/arch/stream_id_lsch2.h>
+#include <linux/sizes.h>
 
 #define CONFIG_SYS_CLK_FREQ		125000000
 
@@ -34,7 +35,7 @@
 #define CONFIG_LAYERSCAPE_NS_ACCESS
 
 /* Size of malloc() pool */
-#define CONFIG_SYS_MALLOC_LEN		(CONFIG_ENV_SIZE + 1024 * 1024)
+#define CONFIG_SYS_MALLOC_LEN		(5 * SZ_1M)
 
 /* PFE */
 #define CONFIG_SYS_FMAN_FW_ADDR		0x400d0000