exfat: Build fsck and update path to mkfs

* Usage of fsck.exfat is already included in partition.cpp, but the
  tool is missing.
* Update the path to mkexfatfs so the button is available when changing
  filesystem.

Change-Id: I5f4e27357c6b5a8606043d1bdc2488cc83e55d90
diff --git a/Android.mk b/Android.mk
index 6e7478c..5d70c18 100644
--- a/Android.mk
+++ b/Android.mk
@@ -368,7 +368,7 @@
     endif
 endif
 ifneq ($(TW_NO_EXFAT), true)
-    LOCAL_ADDITIONAL_DEPENDENCIES += mkexfatfs
+    LOCAL_ADDITIONAL_DEPENDENCIES += mkexfatfs fsckexfat
 endif
 ifeq ($(BOARD_HAS_NO_REAL_SDCARD),)
     LOCAL_ADDITIONAL_DEPENDENCIES += parted
@@ -570,6 +570,7 @@
 endif
 ifneq ($(TW_NO_EXFAT), true)
     include $(commands_recovery_local_path)/exfat/mkfs/Android.mk \
+            $(commands_recovery_local_path)/exfat/fsck/Android.mk \
             $(commands_recovery_local_path)/fuse/Android.mk \
             $(commands_recovery_local_path)/exfat/libexfat/Android.mk
 endif