MFC r222219,222221,222223,222226-222227,222231,222516:

MFC r222219,222221,222223,222226-222227,222231,222516:
  Merge all relevant changes from HEAD to fix long standing
  instability issues of msk(4).  To get desired effect of this
  merge, cold restarting is required because incorrectly programmed
  registers are not reset to default value.
  PR:	kern/114631, kern/116853, kern/139093, kern/144206,
	kern/147824, kern/151169, kern/154591, kern/155636,
	kern/156493

r222219:
  Do not blindly clear entire GPHY control register. It seems some
  bits of the register is used for other purposes such that clearing
  these bits resulted in unexpected results such as corrupted RX
  frames or missing LE status updates.  For old controllers like
  Yukon EC it had no effect but it caused all kind of troubles on
  Yukon Supreme.
  This change shall improve stability of controllers like Yukon
  Ultra, Ultra2, Extreme, Optima and Supreme.

r222221:
  Rework store and forward configuration of TX MAC FIFO. Basically it
  enables store and forward mode except for jumbo frame on Yukon
  Ultra.

r222223:
  Do not configure RAM registers for controllers that do not have
  them.  These registers are defined only for Yukon XL, Yukon EC and
  Yukon FE.

r222226:
  Make sure to enable all clocks before accessing registers.
  Releasing PHY from power down/COMA is done after enabling all
  clocks. While I'm here remove unnecessary controller reset.

r222227:
  Do not touch ASF related register for controllers that do not have
  these registers. Also disable Watchdog of ASF microcontroller.

r222231:
  When MTU is changed, check whether driver should be reinitialized or
  not.  If reinitialized is required, clear driver running flag.

r222516:
  Correctly check MAC running status before disabling TX/RX MACs.

git-svn-id: svn://svn.freebsd.org/base/stable/8@223396 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f