Align end of bss by 4 bytes

Most of the bss initialization loop increments 4 bytes
at a time. And the loop end is checked for an 'equal'
condition. Make the bss end address aligned by 4, so
that the loop will end as expected.

Signed-off-by: Selvamuthukumar <selva.muthukumar@e-coninfotech.com>
Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/board/xilinx/ml401/u-boot.lds b/board/xilinx/ml401/u-boot.lds
index cb90854..b38f648 100644
--- a/board/xilinx/ml401/u-boot.lds
+++ b/board/xilinx/ml401/u-boot.lds
@@ -61,6 +61,7 @@
 	{
 		__bss_start = .;
 		*(.bss)
+		. = ALIGN(4);
 		__bss_end = .;
 	}
 	__end = . ;