sailfish: use mke2fs to create ext4 images

Bug: 23686092
Test: sailfish boots
Change-Id: I618bd24ed6f6101d9d4987f485c88f23a71b007c
diff --git a/sailfish/BoardConfig.mk b/sailfish/BoardConfig.mk
index c8d92db..32ab3cd 100644
--- a/sailfish/BoardConfig.mk
+++ b/sailfish/BoardConfig.mk
@@ -197,6 +197,9 @@
 # Testing related defines
 BOARD_PERFSETUP_SCRIPT := platform_testing/scripts/perf-setup/sailin-setup.sh
 
+# Use mke2fs to create ext4 images
+TARGET_USES_MKE2FS := true
+
 BOARD_PROPERTY_OVERRIDES_SPLIT_ENABLED := true
 
 DEVICE_MANIFEST_FILE := device/google/marlin/manifest.xml