Makefile: copy mke2fs.conf to ota root

Bug: 34947454
Change-Id: I99999c4f56df295c0bb028daf3dcc0898176c5ed
(cherry picked from commit 53524b5da9b714bad890bbe30d92314739881c53)
diff --git a/core/config.mk b/core/config.mk
index badb9b1..a843dbc 100644
--- a/core/config.mk
+++ b/core/config.mk
@@ -599,9 +599,11 @@
 ifeq ($(TARGET_USES_MKE2FS),true)
 MAKE_EXT4FS := $(HOST_OUT_EXECUTABLES)/mke2fs$(HOST_EXECUTABLE_SUFFIX)
 MKEXTUSERIMG := $(HOST_OUT_EXECUTABLES)/mkuserimg_mke2fs.sh
+MKE2FS_CONF := system/extras/ext4_utils/mke2fs.conf
 else
 MAKE_EXT4FS := $(HOST_OUT_EXECUTABLES)/make_ext4fs$(HOST_EXECUTABLE_SUFFIX)
 MKEXTUSERIMG := $(HOST_OUT_EXECUTABLES)/mkuserimg.sh
+MKE2FS_CONF :=
 endif
 BLK_ALLOC_TO_BASE_FS := $(HOST_OUT_EXECUTABLES)/blk_alloc_to_base_fs$(HOST_EXECUTABLE_SUFFIX)
 MAKE_SQUASHFS := $(HOST_OUT_EXECUTABLES)/mksquashfs$(HOST_EXECUTABLE_SUFFIX)