libcutils: add fs_config

Bug: 19908228
Change-Id: I78e6a8d780e578a287ffdee7b7120ecc74797e80
diff --git a/libcutils/Android.mk b/libcutils/Android.mk
index d4450c6..c636196 100644
--- a/libcutils/Android.mk
+++ b/libcutils/Android.mk
@@ -32,6 +32,7 @@
 	sched_policy.c \
 	iosched_policy.c \
 	str_parms.c \
+	fs_config.c
 
 # some files must not be compiled when building against Mingw
 # they correspond to features not used by our host development tools