ipipe: timer: resume hardware operations in oneshot handler
Although we won't allow disabling the hardware when the clock event logic switches a device to stopped mode - so that we won't affect the timer logic running on the head stage unexpectedly -, we still have to enable the hardware when switched (back) to oneshot mode, since it may have been stopped prior to interposing on the device in ipipe_timer_start(). Failing to do so would leave the hardware shut down for both regular and Xenomai operations, with no mean to bring it up again.
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