adding lockdep support to the Blackfin arch

[Mike Frysinger]

ive been extending the Blackfin arch recently to support lockdep.
since i also had to implement irqflags/stacktrace as well, i wouldnt
be surprised if this issue is nested in there, plus this is a no-mmu
system.

at any rate, when i boot up a Blackfin system with PROVE_LOCKING
enabled, i end up with this warning:
Badness at kernel/fork.c:988

which correlates to this in copy_process():
    DEBUG_LOCKS_WARN_ON(!p->hardirqs_enabled);

btw, in order to get this to work in the first place, i had to extend
-mike
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