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/parisc/kernel/traps.c

@@ -282,7 +282,7 @@ void die_if_kernel(char *str, struct pt_regs *regs, long err)
 
 	show_regs(regs);
 	dump_stack();
-	add_taint(TAINT_DIE);
+	add_taint(TAINT_DIE, LOCKDEP_NOW_UNRELIABLE);
 
 	if (in_interrupt())
 		panic("Fatal exception in interrupt");