selftests/livepatch: add DYNAMIC_DEBUG config dependency

The livepatch selftest scripts turn on dynamic_debug of livepatch
kernel source to determine expected behavior.  TEST_LIVEPATCH should
therefore include DYNAMIC_DEBUG in its list of dependencies.

Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
Acked-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Petr Mladek <pmladek@suse.com>