Release linux cknow/6.16~rc7-1 to Unstable

Update to upstream kernel 6.16-rc7. Next to that, these are the most
noteworthy other changes that are part of this release:
- linux-kbuild: Add scripts/make_fit.py
  This script allows to make a FIT image from a kernel.
- crypto: Enable CRYPTO_HCTR2 as module
  This module is needed for the crypto self-tests.
- [arm64] drivers/rtc: Convert most RTC drivers to be built as module
  Some RTC drivers were built-in as some 'historical' artifact and then
  others were built-in as others were. Make it consistent and built all
  the RTC drivers as modules. Which has the 'side' benefit that only the
  RTC drivers which will actually be used are loaded and it allows the
  blocking of RTC drivers which you explicitly don't want.
- lib.debug: Enable MEMTEST
  It's a very simple test and needs to be activated via a kernel
  command-line parameter, but it could give an initial clue that
  something may be wrong with the memory.

Signed-off-by: Diederik de Haas <didi.debian@cknow.org>