plat: marvell: rename common include file

Rename a8k_common.h to armada_common.h to keep the same header
name across all other Marvell Armada platforms.
This is especially useful since various Marvell platforms may
use common platform files and share the driver modules.

Change-Id: I7262105201123d54ccddef9aad4097518f1e38ef
Signed-off-by: Konstantin Porotchkin <kostap@marvell.com>
diff --git a/drivers/marvell/iob.c b/drivers/marvell/iob.c
index acc4941..e88bc16 100644
--- a/drivers/marvell/iob.c
+++ b/drivers/marvell/iob.c
@@ -7,7 +7,7 @@
 
 /* IOW unit device driver for Marvell CP110 and CP115 SoCs */
 
-#include <a8k_common.h>
+#include <armada_common.h>
 #include <arch_helpers.h>
 #include <debug.h>
 #include <iob.h>