MFC if_re.c 1.114 to RELENG_7.   Don't touch MSI enable bit in RL_CFG2 register. For unknown reason   clearing MSI enable bit for MSI capable hardwares resulted in Tx   problems. MSI enable bit is set only when MSI is requested from   user.
MFC if_re.c 1.114 to RELENG_7.
  Don't touch MSI enable bit in RL_CFG2 register. For unknown reason
  clearing MSI enable bit for MSI capable hardwares resulted in Tx
  problems. MSI enable bit is set only when MSI is requested from
  user.

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