todo.md: note that bpf may be disabled on moby

TODO.md

@@ -23,6 +23,9 @@
   - fix by adding `kaslrseed` to uboot script before `booti`
     - <https://github.com/armbian/build/pull/4352>
     - not sure how that's supposed to work with tow-boot; maybe i should just update tow-boot
+- moby: bpf is effectively disabled?
+  - `dmesg | grep 'systemd[1]: bpf-lsm: Failed to load BPF object: No such process'`
+  - `dmesg | grep 'hid_bpf: error while preloading HID BPF dispatcher: -22'`
 
 ## REFACTORING:
 - REMOVE DEPRECATED `crypt` from sftpgo_auth_hook