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/plat/marvell/a8k/a70x0_amc/board/marvell_plat_config.c b/plat/marvell/a8k/a70x0_amc/board/marvell_plat_config.c
index ec4124c..f8a1c40 100644
--- a/plat/marvell/a8k/a70x0_amc/board/marvell_plat_config.c
+++ b/plat/marvell/a8k/a70x0_amc/board/marvell_plat_config.c
@@ -5,7 +5,7 @@
  * https://spdx.org/licenses
  */
 
-#include <a8k_common.h>
+#include <armada_common.h>
 
 /*
  * If bootrom is currently at BLE there's no need to include the memory