init: add TODO for mount operations.

mount operations should be done in vendor init context, but their
complexity currently limits this.  Add a TODO to make this reason
clear to those viewing the code.

Bug: 72488820
Test: N/A
Change-Id: I8b6dd92aa79f31dc24603559ed6de0815facfcba
diff --git a/init/builtins.cpp b/init/builtins.cpp
index 413d11e..caf0c3f 100644
--- a/init/builtins.cpp
+++ b/init/builtins.cpp
@@ -1030,6 +1030,10 @@
         {"load_system_props",       {0,     0,    {false,  do_load_system_props}}},
         {"loglevel",                {1,     1,    {false,  do_loglevel}}},
         {"mkdir",                   {1,     4,    {true,   do_mkdir}}},
+        // TODO: Do mount operations in vendor_init.
+        // mount_all is currently too complex to run in vendor_init as it queues action triggers,
+        // imports rc scripts, etc.  It should be simplified and run in vendor_init context.
+        // mount and umount are run in the same context as mount_all for symmetry.
         {"mount_all",               {1,     kMax, {false,  do_mount_all}}},
         {"mount",                   {3,     kMax, {false,  do_mount}}},
         {"umount",                  {1,     1,    {false,  do_umount}}},