Merge new vendor release - 6.2.9.

Merge new vendor release - 6.2.9.

Details:
o if_em.c changes:
  - Added several new PCI ids.
  - Check em_check_phy_reset_block() before doing SIOCSIFMEDIA ioctl.
  - Don't touch TARC registers, they are now handled in shared
    code in if_em_hw.c.
  - Move RDH and RDT setting to the end of
    em_initialize_receive_unit().
  - Declare em_read_pcie_cap_reg(), now empty.
o if_em_hw.c dropped in from vendor, then restored rev. 1.15.
o if_em_hw.h dropped in from vendor, then modified:
  - Added RX overrun interrupt flag to interrupt enable mask.
  - Remove declarations of em_io_read(), em_io_write().

Approved by:	jfv