ARM: zynq: Change SYS_MALLOC_LEN in zynq_cse_nand_defconfig

nand_scan_tail() function allocates memory dynamically for
struct nand_buffers which needs ~21kbytes of memory. But the
memory alloted with CONFIG_SYS_MALLOC_LEN is 4k which is insufficient.
Increase CONFIG_SYS_MALLOC_LEN to 32Kbytes from which struct
nand_buffers uses ~21kbytes & remaining memory is used for other.

Signed-off-by: T Karthik Reddy <t.karthik.reddy@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/configs/zynq_cse_nand_defconfig b/configs/zynq_cse_nand_defconfig
index 2b58c46..80a427d 100644
--- a/configs/zynq_cse_nand_defconfig
+++ b/configs/zynq_cse_nand_defconfig
@@ -4,7 +4,7 @@
 CONFIG_SYS_DCACHE_OFF=y
 CONFIG_ARCH_ZYNQ=y
 CONFIG_SYS_TEXT_BASE=0x100000
-CONFIG_SYS_MALLOC_LEN=0x1000
+CONFIG_SYS_MALLOC_LEN=0x8000
 CONFIG_ENV_SIZE=0x190
 CONFIG_SPL_STACK_R_ADDR=0x200000
 CONFIG_SPL=y