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/shannon/u-boot.lds b/board/shannon/u-boot.lds
index 6bd0627..fce2533 100644
--- a/board/shannon/u-boot.lds
+++ b/board/shannon/u-boot.lds
@@ -51,6 +51,6 @@
 
 	. = ALIGN(4);
 	__bss_start = .;
-	.bss (NOLOAD) : { *(.bss) }
+	.bss (NOLOAD) : { *(.bss) . = ALIGN(4); }
 	_end = .;
 }