allow init to run mke2fs tools to format partitions

Test: let fs_mgr format a damaged /data partition
Bug: 35219933
Change-Id: If92352ea7a70780e9d81ab10963d63e16b793792
(cherry picked from commit 5f573ab2aa8f566c723f4ddd576f8365dcaec191)
diff --git a/private/file_contexts b/private/file_contexts
index d35d47d..8faa6cd 100644
--- a/private/file_contexts
+++ b/private/file_contexts
@@ -17,6 +17,8 @@
 /charger            u:object_r:rootfs:s0
 /init               u:object_r:init_exec:s0
 /sbin(/.*)?         u:object_r:rootfs:s0
+/sbin/e2fsdroid     u:object_r:e2fs_exec:s0
+/sbin/mke2fs        u:object_r:e2fs_exec:s0
 
 # For kernel modules
 /lib(/.*)?          u:object_r:rootfs:s0