* Linux 5.10 introduces a new lockless ringbuffer. The new ringbuffer
  is structured completely different to the previous iterations.
  Add support for retrieving the ringbuffer from debug information
  and/or using vmcoreinfo. The new ringbuffer is detected based on
  the availability of the "prb" symbol.

* Support newer kernels as follows:

  - 5.10, 5.11, 5.12  (x86_64 SPARSEMEM)

Signed-off-by: Mingli Yu <mingli.yu@windriver.com>
Signed-off-by: Armin Kuster <akuster808@gmail.com>