Generate linker config from recovery init

Generate linker config from recovery init to be used from recovery
processes.

Bug: 139638519
Test: Tested from crosshatch
Change-Id: I777a8baf08254b07375b8039bb252864637e29e7

etc/init.rc

@@ -4,6 +4,10 @@ on early-init
     # Set the security context of /postinstall if present.
     restorecon /postinstall
 
+    # Generate ld.config.txt for recovery processes
+    exec u:r:linkerconfig:s0 -- /system/bin/linkerconfig --target /linkerconfig/ld.config.txt
+    chmod 444 /linkerconfig/ld.config.txt
+
     start ueventd
 
     setprop sys.usb.configfs 0