Merge branch 'allow-referenced-dynptr-to-be-overwritten-when-siblings-exists'

Amery Hung says:

====================
Allow referenced dynptr to be overwritten when siblings exists

The patchset conditionally allow a referenced dynptr to be overwritten
when its siblings (original dynptr or dynptr clone) exist. Do it before
the verifier relation tracking refactor to mimimize verifier changes at
a time.
====================

Link: https://patch.msgid.link/20260406150548.1354271-1-ameryhung@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>