Remove local_t

Current -next has only the trace subsystem left as a user of local_t

Tracing uses local_t for per cpu safe atomic operations in the form
of cmpxchg and additions. We already have a cmpxchg_local but no "local"
form of addition.

The patchset introduces a similar local primitive add_local() and then
uses cmpxchg_local() and add_local() to remove local_t use from the
trace subsystem.

The last patch removes local_t support from the kernel tree.

The support for add_local() is pretty basic. We can add more
fancy inc/dec variants and more optimization in the next
revision of the patchset.

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