selinuxrelabel: Remove attempts to relabel /system

These are a no-op due to the additional block-device protection from
https://android.googlesource.com/platform/system/core/+/e18c0d508a6d8b4376c6f0b8c22600e5aca37f69
so get rid of them entirely. Any installing recovery (or equivalent
installation process) should handle the labeling of system components
on its own.

Change-Id: I14c50f08efa6f05b03fad4fbc404219cc504e1ff
TBD: Do we still want to label unlabeled files?
diff --git a/prebuilt/common/etc/init.d/50selinuxrelabel b/prebuilt/common/etc/init.d/50selinuxrelabel
index d46c23f..dfa576d 100644
--- a/prebuilt/common/etc/init.d/50selinuxrelabel
+++ b/prebuilt/common/etc/init.d/50selinuxrelabel
@@ -9,7 +9,6 @@
 fi
 
 LABELDATA=0
-LABELSYS=0
 LABELDALVIKCACHE=0
 
 # Test /data
@@ -19,25 +18,13 @@
   LABELDATA=1
 fi
 
-# Recheck other files under /data
+# Double-check other files under /data
 ls -Z /data/misc/wifi/wpa_supplicant.conf | grep -q "wifi_"
 if [ $? -eq 1 ]; then
-  $L "data is unlabeled, fixing..."
+  $L "data is mis-labeled, fixing..."
   LABELDATA=1
 fi
 
-ls -Z /system/bin/surfaceflinger | grep -q unlabeled
-if [ $? -eq 0 ]; then
-  $L "system is unlabeled, fixing... (You really should update your recovery)"
-  LABELSYS=1
-fi
-
-ls -Z /system/priv-app/GoogleServicesFramework.apk | grep -q unlabeled
-if [ $LABELSYS = "0" -a $? -eq 0 ]; then
-  $L "Found unlabeled Google framework, fixing..."
-  LABELSYS=1
-fi
-
 ls -Zd /data/dalvik-cache | grep -q unlabeled
 if [ $? -eq 0 ]; then
   $L "dalvik-cache is unlabeled, fixing..."
@@ -51,14 +38,6 @@
 fi
 
 
-if [ $LABELSYS = "1" ]; then
-  busybox mount -o remount,rw /system
-  $L "/system relabel starting..."
-  restorecon -R /system
-  $L "/system relabel complete"
-  busybox mount -o remount,ro /system
-fi
-
 if [ $LABELDATA = "1" ]; then
   $L "/data relabel starting..."
   restorecon -R /data