hw/misc/max78000_aes: Comment Internal Key Storage

Coverity Scan noted an unusual pattern in the
MAX78000 aes device, with duplicated calls to
set_decrypt. This commit adds a comment noting
why the implementation is correct.

Signed-off-by: Jackson Donaldson <jcksn@duck.com>
Message-id: 20250716002622.84685-1-jcksn@duck.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
1 file changed