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/gwin.c b/drivers/marvell/gwin.c
index b5705f7..a4743eb 100644
--- a/drivers/marvell/gwin.c
+++ b/drivers/marvell/gwin.c
@@ -7,7 +7,7 @@
 
 /* GWIN unit device driver for Marvell AP810 SoC */
 
-#include <a8k_common.h>
+#include <armada_common.h>
 #include <debug.h>
 #include <gwin.h>
 #include <mmio.h>