Convert all selinux_android_restorecon and _setfilecon calls to new API.

libselinux selinux_android_restorecon API is changing to the more
general interface with flags and dropping the older variants.

Also get rid of the old, no longer used selinux_android_setfilecon API
and rename selinux_android_setfilecon2 to it as it is the only API in use.

Change-Id: I1e71ec398ccdc24cac4ec76f1b858d0f680f4925
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>

core/jni/android_os_SELinux.cpp

@@ -415,7 +415,7 @@ static jboolean native_restorecon(JNIEnv *env, jobject, jstring pathnameStr) {
         return false;
     }
 
-    int ret = selinux_android_restorecon(pathname.c_str());
+    int ret = selinux_android_restorecon(pathname.c_str(), 0);
     ALOGV("restorecon(%s) => %d", pathname.c_str(), ret);
     return (ret == 0);
 }