e1000e: 82577/8 must acquire h/w semaphore before workaround

The workaround function e1000_configure_k1_pchlan() assumes the h/w
semaphore is already acquired.  This was originally missed when setting up
the part for the ethtool loopback test.

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Tested-by: Jeff Pieper <jeffrey.e.pieper@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>