Remove obsolete MTD support.

Bug: http://b/29250988
Change-Id: Ia97ba9082a165c37f74d6e1c3f71a367adc59945
diff --git a/updater/Android.mk b/updater/Android.mk
index 7c3f616..75af4bd 100644
--- a/updater/Android.mk
+++ b/updater/Android.mk
@@ -40,8 +40,8 @@
     libbase \
     libotafault \
     libedify \
-    libmtdutils \
     libminzip \
+    libmounts \
     libz \
     libbz \
     libcutils \
@@ -60,14 +60,11 @@
     libtune2fs \
     $(tune2fs_static_libraries)
 
-ifeq ($(TARGET_USERIMAGES_USE_EXT4), true)
-LOCAL_CFLAGS += -DUSE_EXT4
 LOCAL_CFLAGS += -Wno-unused-parameter
 LOCAL_C_INCLUDES += system/extras/ext4_utils
 LOCAL_STATIC_LIBRARIES += \
     libsparse_static \
     libz
-endif
 
 LOCAL_C_INCLUDES += external/e2fsprogs/misc
 LOCAL_C_INCLUDES += $(LOCAL_PATH)/..