Revert "Revert "marlin: use mke2fs to create ext4 images""

This reverts commit 4f8d7b1e963d8dba3630112a8ca3f8063541a6f8.

Change-Id: Ib5eb1d5fc5b23d075ae64915003cef0105aca9ca
diff --git a/marlin/BoardConfig.mk b/marlin/BoardConfig.mk
index bd07ac5..38feade 100644
--- a/marlin/BoardConfig.mk
+++ b/marlin/BoardConfig.mk
@@ -210,3 +210,6 @@
 
 # Testing related defines
 BOARD_PERFSETUP_SCRIPT := platform_testing/scripts/perf-setup/sailin-setup.sh
+
+# Use mke2fs to create ext4 images
+TARGET_USES_MKE2FS := true