MFC if_mskreg.h rev. 1.4 to RELENG_6.   Work around GMAC hardware hang bug.   It seems that valid pause frames(Tx flow control) cause GMAC to hang   such that it resulted in watchdog timeout. As a work around don't   flush Rx MAC FIFO if we've received pause frames.
MFC if_mskreg.h rev. 1.4 to RELENG_6.
  Work around GMAC hardware hang bug.
  It seems that valid pause frames(Tx flow control) cause GMAC to hang
  such that it resulted in watchdog timeout. As a work around don't
  flush Rx MAC FIFO if we've received pause frames.

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