Add SELinux filesystem relabeling to init

Since not all recoveries out there will support the OTA packages'
own labeling, check at boot if the system needs labels (and
apply them)

Change-Id: I58767977b90a78a12efe7bd9d713654eadf47e7a
diff --git a/config/common.mk b/config/common.mk
index 96e6ce5..56d53b7 100644
--- a/config/common.mk
+++ b/config/common.mk
@@ -95,6 +95,10 @@
 PRODUCT_COPY_FILES += \
     vendor/cm/prebuilt/common/etc/init.d/90userinit:system/etc/init.d/90userinit
 
+# SELinux filesystem labels
+PRODUCT_COPY_FILES += \
+    vendor/cm/prebuilt/common/etc/init.d/50selinuxrelabel:system/etc/init.d/50selinuxrelabel
+
 # CM-specific init file
 PRODUCT_COPY_FILES += \
     vendor/cm/prebuilt/common/etc/init.local.rc:root/init.cm.rc