Build split file_contexts for recovery

[    7.674739] selinux: selinux_android_file_context: Error getting
file context handle (No such file or directory)

Bug: 62564629
Test: build and flash marlin. Successfully switch between regular
    and recovery modes

Change-Id: I0f871f8842d95322c844fb7b13ad1b4b42578e35
1 file changed