taint: add explicit flag to show whether lock dep is still OK.

Fix up all callers as they were before, with make one change: an
unsigned module taints the kernel, but doesn't turn off lockdep.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
diff --git a/arch/unicore32/kernel/traps.c b/arch/unicore32/kernel/traps.c
index 2054f0d..0870b68 100644
--- a/arch/unicore32/kernel/traps.c
+++ b/arch/unicore32/kernel/traps.c
@@ -231,7 +231,7 @@
 	ret = __die(str, err, thread, regs);
 
 	bust_spinlocks(0);
-	add_taint(TAINT_DIE);
+	add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
 	spin_unlock_irq(&die_lock);
 	oops_exit();