ixl: Update to 1.4.7-k.

Changes by author:

Helin Zhang i40e_shared: Fix compilation error - pointer-arith
Paul M Stillwell Jr i40e-shared: Replace sprintf with i40e_debug
Anjali Singhai Jain i40e-shared: Fix an accidental error with BIT_ULL replacement
Jesse Brandeburg i40e-shared: remove useless assignments
Anjali Singhai Jain i40e-shared: Add a workaround to drop all flow control frames
Anjali Singhai Jain i40e-shared: Add new response struct from FW for AQ command i40e_aqc_lldp_set_local_mib
Anjali Singhai Jain i40e-shared: Acquire NVM, before issuing an AQ read nvm command
Eric Joyner ixl/ixlv: Remove unused MAX_LOOP define.
Eric Joyner ixl: Remove extra aq_get_link_info() call in attach().
Eric Joyner ixl: Modify a couple error messages in attach() to be more informative.
Eric Joyner ixl: Add i40e_get_link_status() call to init_locked().
Eric Joyner ixl: Move callout_stop() to earlier in ixl_stop().
Eric Joyner ixl: Add extra comments around link ITR code.
Eric Joyner ixl: Attempt to enhance link event handling.
Eric Joyner ixl: Style, spacing, and comment changes.
Eric Joyner ixl: Add I40E_NVM_ACCESS definition.
Eric Joyner ixl: Add interface for nvmupdate tool ioctl to driver.
Eric Joyner ixl: Don't strip out nvm update support from the driver anymore.
Eric Joyner ixl: Interrupts are now allocated/setup and torn down/released on init()/stop().

Differential Revision: https://reviews.freebsd.org/D6211
Reviewed by: sbruno, kmacy, jeffrey.e.pieper@intel.com
MFC after: 2 weeks
Sponsored by: Intel Corporation