datapath: Enable RT Kernel supportHEADmaster

I found these files where there can be some issues on RT kernel:
- datapath/datapath.c
- datapath/vport.c
- datapath/linux/compat/workqueue.c

Important calls here are (that doesn't fit well with RT are):
- spin_lock_irq{save}()
- spin_lock_bh()
- local_bh_disable()

1- spin_lock_irq{save}()

These are simply converted to spin_lock() in RT and so access to critical
sections is guaranteed to be serialized.. And so nothing is required to be fixed
for it..

2- spin_lock_bh()

It guarantees code to be serialized and hence shouldn't be a problem..

2- local_bh_disable()

This is how it is implemented:

	+void local_bh_disable(void)
	+{
	+       migrate_disable();
	+       current->softirq_nestcnt++;
	+}
	+EXPORT_SYMBOL(local_bh_disable);

And here is the problem: Code currently using local_bh_disable() isn't
guaranteed to be serialized and so that is required to be fixed.

A simple solution would be to add a spin_lock_bh() for this case which will make
it work (efficiently) for both RT and non-RT cases.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>

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