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>

arch/mips/kernel/traps.c

@@ -396,7 +396,7 @@ void __noreturn die(const char *str, struct pt_regs *regs)
 
 	printk("%s[#%d]:\n", str, ++die_counter);
 	show_registers(regs);
-	add_taint(TAINT_DIE);
+	add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
 	raw_spin_unlock_irq(&die_lock);
 
 	oops_exit();