expose ST_* in OsConstants

Expose ST_* constants via OsConstants. Without these constants being
exposed, it's impossible to meaningfully use StructStatVfs.f_flag
returned from the Os.statvfs() call.

Change-Id: Iae4af8da93e50b3db965a1c8a2af8a32fea37419
diff --git a/luni/src/main/java/android/system/OsConstants.java b/luni/src/main/java/android/system/OsConstants.java
index 8389e5f..1f9205c 100644
--- a/luni/src/main/java/android/system/OsConstants.java
+++ b/luni/src/main/java/android/system/OsConstants.java
@@ -434,15 +434,15 @@
     public static final int STDERR_FILENO = placeholder();
     public static final int STDIN_FILENO = placeholder();
     public static final int STDOUT_FILENO = placeholder();
-    /** @hide */ public static final int ST_MANDLOCK = placeholder();
-    /** @hide */ public static final int ST_NOATIME = placeholder();
-    /** @hide */ public static final int ST_NODEV = placeholder();
-    /** @hide */ public static final int ST_NODIRATIME = placeholder();
-    /** @hide */ public static final int ST_NOEXEC = placeholder();
-    /** @hide */ public static final int ST_NOSUID = placeholder();
-    /** @hide */ public static final int ST_RDONLY = placeholder();
-    /** @hide */ public static final int ST_RELATIME = placeholder();
-    /** @hide */ public static final int ST_SYNCHRONOUS = placeholder();
+    public static final int ST_MANDLOCK = placeholder();
+    public static final int ST_NOATIME = placeholder();
+    public static final int ST_NODEV = placeholder();
+    public static final int ST_NODIRATIME = placeholder();
+    public static final int ST_NOEXEC = placeholder();
+    public static final int ST_NOSUID = placeholder();
+    public static final int ST_RDONLY = placeholder();
+    public static final int ST_RELATIME = placeholder();
+    public static final int ST_SYNCHRONOUS = placeholder();
     public static final int S_IFBLK = placeholder();
     public static final int S_IFCHR = placeholder();
     public static final int S_IFDIR = placeholder();