Fix build.

(This reverts internal commit: 82ca9c2e)
Test: None.

Change-Id: I48bbbe197c8e793bd9888b6ef4dadb2b3466423b
(cherry picked from commit 852aca05)

private/file_contexts

@@ -28,6 +28,7 @@
 /mnt                u:object_r:tmpfs:s0
 /postinstall        u:object_r:postinstall_mnt_dir:s0
 /proc               u:object_r:rootfs:s0
+/root               u:object_r:rootfs:s0
 /sys                u:object_r:sysfs:s0
 
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