Fix watchdog timeout errors seen on a few systems.

The SK-NET GENESIS document says reading the SK_ISSR register should stop
generating further interrupts, but it seems there is the possibility
of losing interrupts between reading the SK_ISSR register and determining
which interrupts have been reported. To cope with this situation we
continuously read the SK_ISSR register until there are no interrupts.

However, it seems that the above workaround does not fix all cases.
Add workaround code that tries to protect against false alarms from
the watchdog handler by trying to reclaim pending Tx descriptors
before resetting the hardware.

This should fix occasional watchdog timeouts seen with this driver.

From FreeBSD

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