plat: marvell: Update Marvell base code version to 18.09.1

Change-Id: I908844364bf8080612aaa6d750d7d2441ecc2eb8
Signed-off-by: Konstantin Porotchkin <kostap@marvell.com>
diff --git a/plat/marvell/version.mk b/plat/marvell/version.mk
index 017e119..16b0a16 100644
--- a/plat/marvell/version.mk
+++ b/plat/marvell/version.mk
@@ -1 +1 @@
-SUBVERSION = devel-18.08.0
+SUBVERSION = devel-18.09.1