Add /bootstrap-apex

It will be used to mount bootstrap APEXes. (with bind-mount to /apex)

Bug: 290148078
Test: atest VendorApexHostTestCases
Change-Id: I1a82af37db368a0eb2bf3a002a47439fb1f8b61d
diff --git a/private/file_contexts b/private/file_contexts
index 123e4ed..c063c3a 100644
--- a/private/file_contexts
+++ b/private/file_contexts
@@ -32,6 +32,7 @@
 /second_stage_resources u:object_r:tmpfs:s0
 /sys                u:object_r:sysfs:s0
 /apex               u:object_r:apex_mnt_dir:s0
+/bootstrap-apex     u:object_r:apex_mnt_dir:s0
 
 # Postinstall directories
 /postinstall         u:object_r:postinstall_mnt_dir:s0