Revert "Revert "init re-execs to set its security context now.""

This reverts commit c819dbe95b.

Bug: http://b/19702273
Change-Id: I5c75b148a12e644dd247a4df4f67dc9b4b9ff8cf

etc/init.rc

@@ -1,13 +1,6 @@
 import /init.recovery.${ro.hardware}.rc
 
 on early-init
-    # Apply strict SELinux checking of PROT_EXEC on mmap/mprotect calls.
-    write /sys/fs/selinux/checkreqprot 0
-
-    # Set the security context for the init process.
-    # This should occur before anything else (e.g. ueventd) is started.
-    setcon u:r:init:s0
-
     start ueventd
     start healthd